turbo pistons in a n/a block

line-runner · Post by **line-runner** » Mon Apr 17, 2006 8:54 pm

hi all,

ive got a question, my friend is giving me some low compression
turbo pistons and was wondering if they will fit my n/a conecting rods.

and how long would it take to install them?

line-runner · Post by **line-runner** » Tue Apr 18, 2006 4:32 am

any one?

isotopeman · Post by **isotopeman** » Tue Apr 18, 2006 4:47 am

You might see if you can edit the subject line to get a better response. "my car" is vague.

Imprezive · Post by **Imprezive** » Tue Apr 18, 2006 4:49 am

Why do you want to lower the compression? Are you planning to put a turbo on it?

line-runner · Post by **line-runner** » Tue Apr 18, 2006 5:09 am

ok ill change the heading. thanks for the heads up

yes im going to be turbo charging my n/a motor and want the turbo pistions for lower compresion.
i just hope they will fit/ mate up with my n/a connecting rods.

douglas vincent · Post by **douglas vincent** » Tue Apr 18, 2006 5:25 am

Are they "A", "B", or "C" size pistons?

Look on the top of your block. There is not quite an imprint, but kinda like writing, that will say something like this....

B C
B B

This means you have three "B" size pistons, and one "C" size piston.

Does this matter? I have not a clue. But I suspect it does.....

Somebody PLEASE correct me if I am wrong!!!

206er · Post by **206er** » Tue Apr 18, 2006 9:10 am

not sure but I am going out on a limb to say that it does matter. guessing its to account for different tolerances from the boring process.???

sammydafish · Post by **sammydafish** » Tue Apr 18, 2006 2:38 pm

yup, Doug is right on, you need the pistons that are sized properly for your bore or else you won't have proper piston/bore clearance. You could fit a smaller piston in, but it would clatter and likely burn oil especaily on cold startup. You can't run a piston that's too big, even though it will likely fit cold it may sieze when hot or at least drag.

Matt Monson · Post by **Matt Monson** » Tue Apr 18, 2006 5:29 pm

C is the smallest bore and A is the largest bore. You do need to match them. IIRC, the difference in bore from one letter to another is .010 mm. You can punch out your block when you hone it for the new pistons and rings (you are using fresh rings, right?). But if you bores are bigger than the turbo pistons you are adding, you are out of luck.

Post up what your block is and what the turbo block is, and I will tell you if you can make it work, if the above is at all confusing to you...

BTW, an easier approach would be to get some DOHC Ej25 heads and manifold and bolt them to your Ej22E bottom end...

line-runner · Post by **line-runner** » Wed Apr 19, 2006 2:30 am

where on the block will i find these letters?

douglas vincent · Post by **douglas vincent** » Wed Apr 19, 2006 2:57 am

Top center. Underneath the water crossover tube, slightly infront if you are lucky.

napphappy · Post by **napphappy** » Wed Apr 19, 2006 5:46 am

Since it is somewhat on subject. Matt what are the letters on your RS-RA?
Mine are all B. I was curious if this was due to a more controlled manufacturing process, i.e STi.

Matt Monson · Post by **Matt Monson** » Wed Apr 19, 2006 3:48 pm

IIRC,
I've got 3B's and an A, but I would have to go look...

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turbo pistons in a n/a block

turbo pistons in a n/a block