excessive fuel consumption... what else can i do?

steptoe · Post by **steptoe** » Mon Sep 03, 2007 9:57 pm

slack/loose/stretched belts will allow the sychronisation of the relationship between crank and cam to be off - but surely not much

tassyraider · Post by **tassyraider** » Tue Sep 04, 2007 1:10 pm

hi as previeous post said
how many kays on vehical
is there a sticker on or around the engine bay stateing when belts changed
i belive the belts to be changed aprox 70,000ks as they may be getting on or past the interval they will be streched and on occurances can jump teeth on cam wheels
its a pain in the arse job to check the bloody things but you are arsking Qs sorry for the inconveaneance
cheerz mick

YouTube · Post by **El_Freddo** » Tue Sep 04, 2007 3:25 pm

Generally if the belt has skipped a tooth you'll know about it, the car will be like trying to push a brick. The interval i'll be working on with my cam belts is 100,000km or a little before this time, as stated in some handbook or service manual...

Cheers

Bennie

92subbie · Post by **92subbie** » Tue Sep 04, 2007 7:39 pm

tassyraider wrote:hi as previeous post said
how many kays on vehical
is there a sticker on or around the engine bay stateing when belts changed
i belive the belts to be changed aprox 70,000ks as they may be getting on or past the interval they will be streched and on occurances can jump teeth on cam wheels
its a pain in the arse job to check the bloody things but you are arsking Qs sorry for the inconveaneance
cheerz mick

Car has done 130000 odd k's. car has full history log book and cam was done at 98,000 i think from memory. i may check this, but im at a loss as to understanding how the car can be timed properly when the belt has jumped?

tassyraider · Post by **tassyraider** » Wed Sep 05, 2007 12:53 pm

l series has 2 heads 1 lil off set to allow 2 belts,say the left belt is rite with timing the right hand may of mooved
each belt has a tenchinor,2 belts,2 tenchinors for a ea 82 motor

YouTube · Post by **El_Freddo** » Wed Sep 05, 2007 4:45 pm

92subbie wrote:Car has done 130000 odd k's. car has full history log book and cam was done at 98,000 i think from memory. i may check this, but im at a loss as to understanding how the car can be timed properly when the belt has jumped?

Its easy to time the spark with the crank, you twist the distributor in which ever direction...

But the valve timing is in the belts and how they relate to the crank, to time these you have to take the cam covers off and check that each side is lined up properly, if not, fix it or replace the belts and do it that way...

So if there is a tooth that has been skipped for what ever reason, someone may have re-aligned the spark to "make it right" when really there is another problem...

Make any sense to someone? I'm not sure that i've explained it the best i could... Its been one of those days...

Bennie

92subbie · Post by **92subbie** » Wed Sep 05, 2007 8:10 pm

yep that makes perfect sense! thanks for that! i am studying automotive engineering so i have a reasonable idea of how engines work and stuff but sometimes its best to get someone to explain it in detail. thanks heaps and i will be sure to check it.

do you think this could make a huge difference though to fuel consump?

Post by **Alex** » Wed Sep 05, 2007 8:36 pm

ej22 conversion??

alex

steptoe · Post by **steptoe** » Wed Sep 05, 2007 8:59 pm

wouldn't it run a bit off if a tooth had been jumped. You mentioned something not right other than fuel consumption ?

92subbie · Post by **92subbie** » Wed Sep 05, 2007 10:06 pm

Alex wrote:ej22 conversion??

alex

lol!! would love a ej20 or 22!!

92subbie · Post by **92subbie** » Wed Sep 05, 2007 10:08 pm

jono wrote:wouldn't it run a bit off if a tooth had been jumped. You mentioned something not right other than fuel consumption ?

yeah thats what i thought. it does "splutter" when the foot goes down but i always thought that was the boxer engine noise, perhaps im wrong? it also pauses for a bit when looking for instance response when the foot goes down at low speeds, say between 2nd and third gear.

YouTube · Post by **El_Freddo** » Mon Sep 17, 2007 2:24 pm

Any change in the valve timing (eg cam belt skipped a tooth) will have an effect on engine performance, unless you've got a stage 2,3 or whatever cam in there it probabily won't increase your performance...

How's it all going anyway? Notice the last msg was before i went a way for a bit...

Cheers

Bennie

92subbie · Post by **92subbie** » Sun Sep 23, 2007 3:16 pm

hey

have given the idea of the cambelt skipping the flick, as i dont think this is the case. i have however had the cat checked by true flow exhaust at no expense (although it wasnt cut open to check 100% that its stuffed). they put it up on the hoist hit it a couple of good times and it didnt rattle. then we put it down and checked the flow out of the exhaust. now this is something i have never thought of doing and have only felt the flow at idle. at idle the flow is good and you can feel good pressure when you put your hand close. however, when you rev it up to say about 2,500rpm the flow gets significantly less!! this was weird...
the bloke at the exhaust shop had never experienced this before and he said that he bet his left nut on it being a stuffed cat! haha! so yeah we went and checked the price of a new cat and installed it was going to be 550... i was startled some what! but i know of someone who may be able to get me one for 400 or less so ill be putting one in myself.
what are your thoughts on all this guys?

YouTube · Post by **El_Freddo** » Mon Sep 24, 2007 10:43 am

92subbie
Get a "striaght" through cat, but don't mention anything sports, this adds near 40% onto the price instantly.

Other method is to crush the inners of the cat and shake them out. My car did this itself when 4wd'n, it rattled for a bit so i took it off and shook out the crap. All good now.

Other than that, replace it or get someone to do it for you.

Cheers

Bennie

steptoe · Post by **steptoe** » Mon Sep 24, 2007 10:02 pm

if that's it - don't forget the man that put you in the right direction.

92subbie · Post by **92subbie** » Wed Oct 03, 2007 10:23 pm

is there different sorts of cats you can get? like i mean can i get a "universal" one? is the genuine Subaru one (the one i was quoted for) include from the headers all the way to the next join after the cat? or is it just for the cat itself and i would need to weld it in no matter what cat i get?

whats the go with these "straight" through cats El_Freddo?

steptoe · Post by **steptoe** » Thu Oct 04, 2007 2:09 pm

Unless you need it to last you until your next lifetime there is little need to go genuine, just after market at your local exhaust shop - if they are available. The genuine original is a one pice y pipe from heads to beyond cat to mid pipe as would the after market one too I would expect. The straight thru cat may be just an emergency/diagnostic fix but not legal. It is simply a case of bashing the insides out of the cat where it sounds to be blocked. If this then sorts your problem you go buy new to remain legal and non polluting.

YouTube · Post by **El_Freddo** » Tue Oct 09, 2007 10:08 am

steptoe wrote:If this then sorts your problem you go buy new to remain legal and non polluting.

About the non-polluting part. This is only if you're replacing your cat every two years, after that they are no good from what i've read.

A straight through cat apparently still works like a regular cat, costs more but is much more free flowing than a standard factory unit. This is what i was recommended for future exhaust ideas. I dunno if you can get one but i've heard its a sports job.

The cat on my car is hollow now, i was 4wd'n one day and hit it on a rock, it rattled from then on for a week and the car ran like sh!t, after that it was fine and seemed to run better. Sounds tinny now though, i've hit another rock at some stage and its got a good mark in it now...

Bennie

Fatz · Post by **Fatz** » Tue Oct 09, 2007 11:30 am

check for split fuel hoses under the car. i have had this problem.

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Tue Oct 09, 2007 1:53 pm

If you are going to buy a cat get the one that suits the most common vehicle as it will generally be the cheapest and that it would probably be to suit an engine of twice you capacity flow wont be an issue.