knock with 2.5
#1
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knock with 2.5
just fitted my ej257 with a set of sti3 heads i have set the max rev to 3000 for running in but the knock is hitting between 20 and 30 on the hand commander just running in is this normal with the 2.5 engine?
there does seem to be a slightly noisy tapped.
cheers david
there does seem to be a slightly noisy tapped.
cheers david
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#9
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I can't remember the gaskets I used for my 2.5 with STI3 heads, but the subaru PN is 11044AA610
APIDavid might be able to tell what they are
I take it your using a Link ECU. Have you mapped for the 2.5 or just running the 2 litre map?
Did you check the shimming of the heads before assembly?
APIDavid might be able to tell what they are
I take it your using a Link ECU. Have you mapped for the 2.5 or just running the 2 litre map?
Did you check the shimming of the heads before assembly?
Last edited by Dyney; 23 October 2005 at 09:44 PM.
#10
I have the same basic engine, ej257/ver3 sti heads and used the 1.6mm gaskets and have no problems.
If you are using a map based ecu like the link i can see a big problem with out having a remap. If it was a powerfc or the factory ecu its not as drastic as it knows how much air the engine is using with the maf.
If you are using a map based ecu like the link i can see a big problem with out having a remap. If it was a powerfc or the factory ecu its not as drastic as it knows how much air the engine is using with the maf.
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Originally Posted by simbo
got the headgaskets from mark at lateral and the the ecu is a power fc
UNLESS by mistake you have 2.0 gaskets - unlikely from a professional like Mark. but it is possible to make a mistake.........
Best to let a professional hear it to save time.
David APi Engines / APi Impreza
www.apiengines.com
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Originally Posted by APIDavid
1.6 mm gaskets for that are fine, exactly what we would have supplied. I was just checking that the pistons weren't hitting the heads. They won't on that configuration.
UNLESS by mistake you have 2.0 gaskets - unlikely from a professional like Mark. but it is possible to make a mistake.........
Best to let a professional hear it to save time.
David APi Engines / APi Impreza
www.apiengines.com
UNLESS by mistake you have 2.0 gaskets - unlikely from a professional like Mark. but it is possible to make a mistake.........
Best to let a professional hear it to save time.
David APi Engines / APi Impreza
www.apiengines.com
Try, and borrow some det' cans, to identify if it's det', or mechanical noise.
Is it noisy all the time, or only under certain conditions ?
Try pulling out 5 degrees to see if it helps, if not, it's more likely to be mechanical.
One last thing to check, is the knock sensor. It's not uncommon for them to have an issue, and show more noise than exists !!!
Mark.
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tried retarding the timming no difference at all seems to be picking it all the time its ok at idle but as soon as you lift the revs up it goes
cheers david
cheers david
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Originally Posted by Dyney
I can't remember the gaskets I used for my 2.5 with STI3 heads, but the subaru PN is 11044AA610
APIDavid might be able to tell what they are
I take it your using a Link ECU. Have you mapped for the 2.5 or just running the 2 litre map?
Did you check the shimming of the heads before assembly?
APIDavid might be able to tell what they are
I take it your using a Link ECU. Have you mapped for the 2.5 or just running the 2 litre map?
Did you check the shimming of the heads before assembly?
Well done Dyney.
David APi Engines / APi Impreza
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ahh, just seen its knock count from the power fc. Still need to listen with det cans and confirm not a dodgy knock sensor.
Where do you have the sensor mounted? OEM position or elsewhere?
Steven
Where do you have the sensor mounted? OEM position or elsewhere?
Steven
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Originally Posted by WUZ
Sounds like the wrong gaskets for STi3 heads, AFAIK the hace a different squish volume to your old WRX heads.
Best you speak to Mark at Lateral of get Andy's help PRONTO!!!!!!!!!!!!!!!!!!!
Russell
Best you speak to Mark at Lateral of get Andy's help PRONTO!!!!!!!!!!!!!!!!!!!
Russell
cheers david
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David, i was refering to the christmas tree effect of the knocklink, but from your posts you dont mention that you have one, you just refer to the count from the PFC.
With the car stationery, does the knock count increment in the same way, as it does when driving?
Det cans needed
With the car stationery, does the knock count increment in the same way, as it does when driving?
Det cans needed
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Originally Posted by P20SPD
David, i was refering to the christmas tree effect of the knocklink, but from your posts you dont mention that you have one, you just refer to the count from the PFC.
With the car stationery, does the knock count increment in the same way, as it does when driving?
Det cans needed
With the car stationery, does the knock count increment in the same way, as it does when driving?
Det cans needed
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The tappet, if loud enough, could well get picked up by the knock sensor which is afterall just a microphone.
Sounds more like noise than det. Monitor the knock count with the graphing option on the PFC, det would show as a sudden spike rather than a gradual rise as the revs increase.
Sounds more like noise than det. Monitor the knock count with the graphing option on the PFC, det would show as a sudden spike rather than a gradual rise as the revs increase.
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yeh seems to be engine noise just have to work out what it is but the tappit is really noisey
can the tappets be checked an reshimed in place or does the engine need to come out AGAIN i did get them checked when i got the heads skimmed
cheers david
can the tappets be checked an reshimed in place or does the engine need to come out AGAIN i did get them checked when i got the heads skimmed
cheers david
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Originally Posted by Zen Performance
shim out of place on heads.
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ok checked the valve clearences today the noisy one is 13 thou on an exhaust valve so i take thats not enough to give the knock count of 32 then any other sugestions?
cheers david
cheers david