Tweety's ea81 build

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tambox
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Post by tambox » Tue Dec 16, 2014 7:17 pm

Weber carbs are very adjustable and can be set to work over a wide range.
I had a Datsun 1600, L18 motor, "hot" cam, running 2 x twin 45DCOE Weber's. That's one 45 for each cylinder.
Responsive, reasonable economy (relative to how hard you push the go pedal) and loved a rev. A good dyno tune was all it needed.
L serious, still.

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Subydoug
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Post by Subydoug » Tue Dec 16, 2014 8:21 pm

Just a side note that I thought was interesting. Running injection on mine now and the peak VE figure I reach is 61% at 2300rpm. So the ea81 is actually breathing in just over a litre of air ;). I will have to double check my Req fuel but its pretty close.

Are you going to have it dyno tuned Tweety?

Regards

Doug

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Tweety
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Post by Tweety » Tue Dec 16, 2014 8:49 pm

Eventually a dyno is on the list Doug. But many other things will almost wipe off this riding season. engineers cert is priority then I can insure it and Vicroads fully complied with. etc.

And then there's my man cave.....

Yes, Greg, had a 1558cc Lotus Ford Escort with twin 40DCOE's. closest thing to fuel injection I reckon. One throat per cylinder.
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Tweety
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Post by Tweety » Thu Jan 08, 2015 7:07 pm

Finally my new stock after market coil arrived.

I had a master blaster coil that had 4700 ohms whereas the stock coil has around 10,000-15,000ohms. I suppose that means more spark at the plugs at the risk of burning out the dizzy module.

The engine hasnt been started for several days. It is a real thrill to have a sound engine start up, choke, one squirt on the throttle, and bamm...starts immediately on high idle. Choke in after 5 seconds and all good, will idle contently if I wanted it to. New motor entirely is nice and it elliminates all thoughts of possibles a worn engine gives you.

I've noticed the throttle revving from standstill revs easily without hesitation but when on the road I get that hiccup when accelerating off the mark unless I take it slow. This could be the 91 octane I'm using from my mower fuel until I get to a garage to get the 95 in the tank (maybe 98 later). Also apart from timing at 8 degrees and mixtures screws correctly adjusted then readjusted there has been no other adjustments.
Tappets are 16 thou each as per the EB. To be reset in a few hundred kms. There is no tappet noise surprisingly.
Plugs are platinum to 32 thou. Anyone think of why there is this hesitation? Just a general bogging down

My speedo isnt working ATM. I was surprised when going on this test run. It cruised so well at a certain speed, thought about 80 kph. But realised the engine was doing 3500rpm which equals 110kph real speed. Speed on the trike is hard to gauge. So it is so far very impressive.
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Subydoug
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Post by Subydoug » Thu Jan 08, 2015 7:47 pm

Try winding out the mixture screw an extra 1/4 or 1/2 turn (dont worry about it being a little bit rougher at idle, its just temporary) and go for a drive. If it stops it from stumbling off idle then your accelerator pump needs to give more juice.

From memory, weber carb's have pump jets which you can change. If your idle "mixture" screw is set right, 1-1/2 to 2 turns out, then maybe look into the pump jet.

Regards

Doug

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Tweety
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Post by Tweety » Thu Jan 08, 2015 8:25 pm

Thanks Doug
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Nubaru
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Post by Nubaru » Thu Jan 08, 2015 9:41 pm

would that be a scratchy old TPS or a dodgy Coolant Temp Sensor ?? :p
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tambox
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Post by tambox » Fri Jan 09, 2015 8:08 pm

Some webers have an initial progression stage casting that can be drilled to suit your engine.
This is a bit complicated, but it gives good economy and eliminates flat spots on initial progression.
A lot of people just put bigger jets in, this solves the flat spot problem, but reduces efficiency/economy.
Have you got the HPBooks weber manual, it explains, in detail, how they work and how to set them up.
As well as porting and cam timing effects.
A smooth tune can be done on the road, an efficient tune needs a dyno and someone that knows all the weber options.
Happy to lend it to you.
L serious, still.

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Tweety
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Post by Tweety » Fri Jan 09, 2015 9:36 pm

Hi Tambox

Umm, thankyou Greg but my working on the mechanicals has ground to a halt. New carbie and me fiddling with it is a garrantee to messing it up.

Will try higher octane soon and maybe 10-12 BTDC. but that will be it. A dyno would be the best method for me. I'm burned out. I'm nearly 59yo and most of my 50's has been spent working on this trike instead of riding it.

VW performance centre would be my choice. Tweety has been strapped in there a number of times. Engineer is on the 20th Jan and then can insure it with this new engine. Dyno can wait a while after run in.
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Nubaru
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Post by Nubaru » Sat Jan 10, 2015 6:18 am

I have been enjoying this entire thread, and swear you were mid 50's when all this started !

I know with humans and organ donation - includes eye bits, anti-rejection drugs are required for life. Have you considered any medication for Tweety ?
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Tweety
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Post by Tweety » Sat Jan 10, 2015 3:18 pm

Thanks Nubaru

It's been a journey alright.

Had I had a manual transmission or not lost 14hp from the VW automatic I wouldnt have embarked on the trek to get enough power to tow my van.

Now that I've sold the van and have the small Detour camper trailer, I dont need that extra power. But tweety with this tight new engine, the 38/38 carb and re-sealed auto I will have many trouble free kms all through my retirement. I'm finally very happy.


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[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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tambox
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Post by tambox » Sat Jan 10, 2015 6:34 pm

Yes Tony, time to enjoy the efforts that have gone into this masterpiece.
L serious, still.

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Nubaru
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Post by Nubaru » Sat Jan 10, 2015 8:08 pm

Tweety is indeed a pretty fine looking piece of machinery with its own touches by yourself.
I for one would like to see some up close pics of say, does her - Tweety a boy or girl ?? lid flip to reveal engine and trans from above. This may be a Subaru forum but has gone a bit dull in recent times and should celebrate the tinkering you've done - just include some Subaru bits to qualify entry ;)
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Tweety
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Post by Tweety » Sat Jan 10, 2015 8:27 pm

Tweety is non sexual. lol

Mods include-

Hawse pipes. These are for boats so the anchor ropes go through the deck. Stainless of course. these were for extra cooling when the first MR2 radiator was mounted over the torque converter.

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Also found on ebay are 5 vane goat vents. this one lifts up to reveal the cap for the overflow coolant bottle

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The curves are magnificent. Most males agree

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The exhaust was a bone of contention among my friends. eventually I took some advice and made the tailpipes on the same angle as the rear of the roof. no regrets

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Trikes with roofs are rare. Most are in USA. This one is in NZ

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more to come
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Tweety
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Post by Tweety » Sat Jan 10, 2015 8:46 pm

This is the engine bay access

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An impressive rear view. This was with the supercharger

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The van that weighed too much

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Tweety's sunroof is off a Mazda 121 'funtop' and is electric operated. The rear luggage rack shown here was made from one of those 4WD steps that go on the wheel to get to items on the roof, turned upside down and bolts to a bike rack bar, the type that clamps hard onto a tow ball. Has taken 40kgm bag to Qld and back to Vic no probs.

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Rear view is made easier with this camera supplied by 4K of the UK. wireless there is one on the rear of the camper. Best thing is seeing cars come up from behind. mirrors are needed for legal purpose but arent that good.

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Our camper. if you want to see it being erected (under 2 minutes) see the Detour motorcycle camper video (google it) has queen bed. etc

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[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Nubaru
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Post by Nubaru » Sat Jan 10, 2015 10:28 pm

some great shots there, thanks! The rag top looks like inspiration came from 1970's Matchbox series ...looking for links..

[img]http://retrique.com/new120413/wp-conten ... 00x220.jpg[/img]

??

just found new interest gogling matchbox cars I used to own :(
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Tweety
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Post by Tweety » Sun Jan 11, 2015 9:44 am

There are so few trikes with roofs if you google "trike roof" most pics are of tweety

A roof on a trike is a delicate modification. It has to be done 'right' in that if it doesnt look good it look terrible.

The front of a trike goes to zero dimensions so a totally square roof looks rubbish and a pointy one look odd. I wanted to have the option of sunshine and wind in the hair like a motorcycle, the safety and security of a trike, protection from the elements etc. Most trike owners I've met scoff at the roof as if "we dont need a roof- we're tough" but when the cold windchill hits them I know its a different story. Even strong wind can hurt your neck and the original thought of a roof came about because my wife has arthritis in the neck.

Various small windscreens were tried and the turbulance was really bad. A large one half the size of tweety's current one was tried- no good. Hence the roof. That roof cost $7000. By the time I gave my drawings to my engineer, had it made, powder coated, covered with Mercedes soft top fabric and strengthened the rear frame to carry the weight and engineers certificate.

But I wouldnt have a trike any other way. There was a time when I thought of upgrading to a Touroz (google it) or Boom trike (google that too) - they have Ford Focus engines and trans, but when I did, I was already designing a roof for it. So the cost blew out.

Tweety will never be a ball of accelerating fire. That's not his purpose. I've always believed that to have a tar lifter you should be on the track. Sure an extra 50hp would be nice. I've taken advice from many here to get the best option for the ea81- torque at lowest revs and high compression...just to allow the machine to overcome most of the drain the auto gives.

From the short test rides, I already know I'll be happy. It's "throaty", smooth and feels right. Hence am over the moon.

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Cheers
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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El_Freddo
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Post by El_Freddo » Mon Jan 12, 2015 3:20 pm

And it's even better "in the flesh"!

Hope all goes well with the engineering side of things - I don't see any reason why it won't!

Cheers

Bennie
"The lounge room is not a workshop..."
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El Freddo's Pics - El_Freddo's youtube

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Tweety
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Post by Tweety » Mon Jan 12, 2015 8:17 pm

got an email from my engineer.
Cost will be around $880 for the certificate.

Firstly I have to get a weighbridge cert. For the front wheel, the rear wheel weight combined and total weight. lined that up for 11am tomorrow, Euroa luckily...15 minutes away.

With trikes the centre of gravity is critical and stability tests are required which comprises of ?????

There is a fair bit of weight in the radiator with coolant. But it is likely balanced out by the weight of the exhausts and extra strengthening of the roof. Measurements like centre of wheels to end of toxbar he wanted to know and distance between exhaust tip ends eg max distance. etc. fingers crossed.

Moral of the story is- change engine manufacturers and it costs you a packet. If ever I get pulled over by police I wont care if they searched tweety all over (he like strip searching)- they wont find a thing.
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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Tweety
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Post by Tweety » Sun Jan 18, 2015 9:12 pm

Running in has almost concluded and done in the hills of the Strathbogie tablelands, a wonderful place to do it.

I had the odd issue. The oil cap when tightened went all the way around back to the tabs meaning it was loose. Oil was sprayed around the thermostat area and exhaust. But was fixed easily. Handbrake assembly fell apart etc.

Anyway 360 kms was enough and oil filter changed and new oil added. Penrite diesel HPR15 as recommended by Penrite and will stick to that. Probably changed twice a year about 8,000 kms between changes.

Economy. Well as you can imagine a tight engine accelerating up steep inclines etc it wouldnt be great. But 11.5L/100kms (25mpg). And thats with a motor running rich- is very impressive. Trike weighs 660 kgms as weighed a few days ago.

The engine is so smooth, starts in an instant when cold and will idle without choke after 15 seconds if desired. The low to mid range pick up is much improved over the original 32/36 weber version with stock manifold.

So how does it compare with the supercharged version? Well the SC would if desired, lift the front wheel off the ground on take off and when changing from 1st to 2nd on the auto. I havent and likely wont try to do those actions again but the new engine does lift the front suspension a lot if wanted kind of between the old weber and the SC in kick in the butt. This proves to me that the move to utilise the SPFI manifold and 38/38 synchronic carb, a real gamble, paid off. Quite a relief. A dyno one day will see better results too.

A real buzz for me is the smoothness. Balancing the engine- do it!!! if reconditioning.

Engineers check Tuesday.
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.

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