I'm looking for the proverbial needle in the haystack. 2 years ago, I purchased a set of NOS, Poly 318 forged TRW Pistons # L2097F in +.030" oversize. I'm just now beginning to get going on my block and rough bore was just about to begin when it was discovered that one piston of the set of 8 is actually a +.040" piston. I know at the time I bought mine that they also had a +.040" over set which sold. So, I'm hoping that a member here may have been that person and he may have my +.030" piston in his set. Doubtful but worth a shot.
I've been doing some checking in the last 30 minutes and ironically found an NOS single piston on eBay, also L2097F but in +.020" over! Amazing. The search goes on.....
- EM
TRW Piston L2097F
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- marklein
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Re: TRW Piston L2097F
Weigh the .030 and .040 pistons, supposedly they should be the same. If you balance this engine, I doubt if you would have any ill side effects. I bought a dart sport once that had a .030 over piston with the rest being stock bore. Could not tell. Not ideal, but might come down to this.
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Re: TRW Piston L2097F
No. There is a difference in the bore AND the ring grooves. I can machine the piston as a last resort but I want to try to see what I can find first. Setting up to machine the O.D. requires a special (and extremely accurate) holding jig.
- EM
- EM
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Re: TRW Piston L2097F
marklein wrote:Weigh the .030 and .040 pistons, supposedly they should be the same. If you balance this engine, I doubt if you would have any ill side effects. I bought a dart sport once that had a .030 over piston with the rest being stock bore. Could not tell. Not ideal, but might come down to this.
Sorry. I mis-read your reply in my haste. Yes, I can do that and already thought of that. It certainly would work but I don't like doing things that way.
- EM
- marklein
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Re: TRW Piston L2097F
I don't like the idea of it either, but it may come to that. Must be one somewhere, does TRW still exist or is it called something different now? Perhaps contact them?
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Re: TRW Piston L2097F
If you got them from a speed shop out Lansing, MI off ebay. I got 0.040 set. Just went through my set I haven't installed yet. All are0.040.
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Re: TRW Piston L2097F
Thanks for your reply Viking. Yes that is the shop. I appreciate that you checked your set. I have a set of later model TRW pistons (also +.030") on the way to keep me going on the build but I'll continue to look for the replacement to my set.
- EM
- EM