How would you tell a genuine sti engine from a wrx one?
#1
How would you tell a genuine sti engine from a wrx one?
I've been looking at engines for sale as an upgrade for my car and wondered how you would tell these two engines apart externally.
I know on the sti3 onwards the inlet manifold is red but that doesn't really mean anything.
Are there any identifying marks on the head/block or is the engine number unique to sti models?
Also is there any way of telling which model sti it came out of?
Thanks
I know on the sti3 onwards the inlet manifold is red but that doesn't really mean anything.
Are there any identifying marks on the head/block or is the engine number unique to sti models?
Also is there any way of telling which model sti it came out of?
Thanks
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I know on the sti3 onwards the inlet manifold is red but that doesn't really mean anything.
externally there isnt much of a givaway ......was the turbo different from the wrx to the sti? and the intercoolers perhaps? a block will look like a block to me
#5
Originally Posted by Neilo
only from the sti3 on.....
externally there isnt much of a givaway ......was the turbo different from the wrx to the sti? and the intercoolers perhaps? a block will look like a block to me
externally there isnt much of a givaway ......was the turbo different from the wrx to the sti? and the intercoolers perhaps? a block will look like a block to me
There is no inlet manifold, intercooler or turbo so it could be anything. I wondered if there were any markings that gave away what it is without opening it up
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I think the red inlet manifold was from the version 2 onwards, they were the first cars to be produced by STI, not just modded after the production line.
My V.2 has a red inlet manifold.
My V.2 has a red inlet manifold.
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#8
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Originally Posted by paulpalmer
I've been looking at engines for sale as an upgrade for my car and wondered how you would tell these two engines apart externally.
I know on the sti3 onwards the inlet manifold is red but that doesn't really mean anything.
Are there any identifying marks on the head/block or is the engine number unique to sti models?
Also is there any way of telling which model sti it came out of?
Thanks
I know on the sti3 onwards the inlet manifold is red but that doesn't really mean anything.
Are there any identifying marks on the head/block or is the engine number unique to sti models?
Also is there any way of telling which model sti it came out of?
Thanks
oi palmer stop modding ffs...stop it now
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Agree with Banny STI.
I think the only sure way is to whip a cam cover off. 10mm socket, 4 bolts, 1 min.
If the cams are actuating directly on buckets its an STI.
I think the only sure way is to whip a cam cover off. 10mm socket, 4 bolts, 1 min.
If the cams are actuating directly on buckets its an STI.
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Yes.. but not in a head.. although should have my own back very soon..
http://www.jollygreenmonster.fotopic.net/p18419813.html
The shim is the small item like a watch battery.. it goes under the bucket..
WRX / UK heads have shims like 10p's and sit on top of the buckets.
If you remove the cam cover and look the cam lobe will hit the bucket rather than hitting a shim on top of the bucket..
Simon
http://www.jollygreenmonster.fotopic.net/p18419813.html
The shim is the small item like a watch battery.. it goes under the bucket..
WRX / UK heads have shims like 10p's and sit on top of the buckets.
If you remove the cam cover and look the cam lobe will hit the bucket rather than hitting a shim on top of the bucket..
Simon
#19
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So just out of interest, DO the STi's run hotter cams or is it just down to the differences in the tapepts? What are the fundamental differences between a classic STi head and a WRX head? I'd always thought that most of the STi's power was made by the ECU/turbo combo rather than any particular differences in the engine, barring the fact that some were blueprinted or closed deck, which surely would really only start to matter once you begin tuning it properly.
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the cams are longer duration and higher lift..
I compared my STi3 cams with some UK98 cams
http://www.jollygreenmonster.fotopic.net/c683651_1.html
http://www.jollygreenmonster.fotopic...683651_13.html
Other differences are the shims being under bucket on the STi (less chance of the shim falling out) and the UK / WRX having over bucket.. so the rev limit can be higher on the STi heads. The valves are also different.. STi are sodium filled hollow and the WRX/UK solid.. the springs are also stronger on the STi again allowing higher rev limit as less chance of valve bounce.
Closed desk was not really an STi thing.. just some of the earlier cars had the closed deck block.. which was originally used on the Legacy.. perhaps just old stock used up on the Impreza before going with the open deck block?
But not STi specific. iirc
Simon
I compared my STi3 cams with some UK98 cams
http://www.jollygreenmonster.fotopic.net/c683651_1.html
http://www.jollygreenmonster.fotopic...683651_13.html
Other differences are the shims being under bucket on the STi (less chance of the shim falling out) and the UK / WRX having over bucket.. so the rev limit can be higher on the STi heads. The valves are also different.. STi are sodium filled hollow and the WRX/UK solid.. the springs are also stronger on the STi again allowing higher rev limit as less chance of valve bounce.
Closed desk was not really an STi thing.. just some of the earlier cars had the closed deck block.. which was originally used on the Legacy.. perhaps just old stock used up on the Impreza before going with the open deck block?
But not STi specific. iirc
Simon
#21
Thanks, all of this is confirming what I thought. I have sent an email to the seller asking them how they know that this is a genuine sti engine and I'll see what they come back with. Removing the cam covers is quite an easy way to tell it seems.
Thanks
Thanks
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Originally Posted by shaggy1973
dont sti engines generally have the fifth injector where as wrx engines do not? surely a simple way of seeing?
Simon
#26
Originally Posted by Jolly Green Monster
get them to take a cam cover off and email you a picture.. then post it and we can tell if it is what they say it is.
cheers
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About the best i have Paul. The top pic if you look closely you can see the cam is acting directly on the bucket.
Combine it with the bottom pic, they use a small shim that sits under the bucket (not on top) so you will not see the shim if the engine is fully built.
Bucket is far right, shim is next to it.
http://img.photobucket.com/albums/v3...k/DSC00306.jpg
http://img.photobucket.com/albums/v3...k/DSC00300.jpg
Combine it with the bottom pic, they use a small shim that sits under the bucket (not on top) so you will not see the shim if the engine is fully built.
Bucket is far right, shim is next to it.
http://img.photobucket.com/albums/v3...k/DSC00306.jpg
http://img.photobucket.com/albums/v3...k/DSC00300.jpg
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Just been out to have a look at my spare ones Paul, they defo have little watch battery like shims under the buckets. I thought i had bought Rex, oh well i can live with that.....just need pistons now.
Great info lads
Great info lads