Piston Choices
- Thread starter cometguy
- Start date
A
Anonymous
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Cometguy,
To my knowledge no one is offering any hypereutectics so forged is your only upgrade for strength. Mike has some dished versions on his website. There are some old TRW dished forgings that pop up on ebay once in a while also which may be had a little cheaper.
To my knowledge no one is offering any hypereutectics so forged is your only upgrade for strength. Mike has some dished versions on his website. There are some old TRW dished forgings that pop up on ebay once in a while also which may be had a little cheaper.
ACL Australia do offer a standard-style piston I believe to be hypereutectic. Part number 6MKRY4105 with moly top ring. It's a 15.3cc dish. There's a "Race Series" in flat top and reduced dish (8cc) available also - three rings still, but with better oil return and stronger skirts. All the ones mentioned have a compression height of 0.912", which is stock AFAIK.
Regards, Adam.
Regards, Adam.
A
Anonymous
Guest
The old TRW forged numbers are L2217F.
Also, the same exact piston in a sealed power box is a 2262P
I have two sets, the stds I have are selaed power, and the .020" set I have is TRW.
Also, the same exact piston in a sealed power box is a 2262P
I have two sets, the stds I have are selaed power, and the .020" set I have is TRW.
cameljockey
Well-known member
any possibility that buick 231 pistons could workor maybe even chevy 250 I-six pistons you'll have to forgive my ignorance 
on this matter I've searched all over to try and find specs for these other engines to see if anything else will work. I know hsc pistons will work for 200 cid engines but I'm working with a 250 from a '71 maverick so the other problem is the low compression which I'm sure can be solved by some longer rods but agian what works? :x If there was some kind of encyclopedia of rods and pistons with all the dimmensions and tolleracnces listed wouldn't that be grand 
: 
any how I've just about finnished my rearend and won't be spending that much for a while but that leaves more time for research I guess.
Keep sixn'
Dan Hanna
on this matter I've searched all over to try and find specs for these other engines to see if anything else will work. I know hsc pistons will work for 200 cid engines but I'm working with a 250 from a '71 maverick so the other problem is the low compression which I'm sure can be solved by some longer rods but agian what works? :x If there was some kind of encyclopedia of rods and pistons with all the dimmensions and tolleracnces listed wouldn't that be grand : any how I've just about finnished my rearend and won't be spending that much for a while but that leaves more time for research I guess.Keep sixn'
Dan Hanna
Howdy Comet guy:
IF you're building a specification engine for competition in IRHA, you can use the stock type cast replacement piston. If I'm not mistaken they are available in .040" and .060" oversize. Make sure you specify the small dish, 6.5 or 7 cc pistons. They can be fitted a little tighter and will easily hold up to this level of competition.
Most replacement piston are down and additional .005" in pin height. So check them carefully when planning your block build, relating to the deck height.
What IRHA class are you building for and what vehicle will you be competing with?
Adios, David
IF you're building a specification engine for competition in IRHA, you can use the stock type cast replacement piston. If I'm not mistaken they are available in .040" and .060" oversize. Make sure you specify the small dish, 6.5 or 7 cc pistons. They can be fitted a little tighter and will easily hold up to this level of competition.
Most replacement piston are down and additional .005" in pin height. So check them carefully when planning your block build, relating to the deck height.
What IRHA class are you building for and what vehicle will you be competing with?
Adios, David
cameljockey":les0ds1m said:...but I'm working with a 250 from a '71 maverick so the other problem is the low compression which I'm sure can be solved by some longer rods but agian what works? :x If there was some kind of encyclopedia of rods and pistons with all the dimmensions and tolleracnces listed wouldn't that be grand
The rods from a 2.5 HSC are 5.99 inches long and will push your stock pistons up higher. Also, 255 pistons are .085" taller and fit nicely into a 250 using stock rods.
As for your "encyclopedia", try this.
cameljockey
Well-known member
very Good info thankyou so much but being greedy as I am 
would 6 in or 6.02 in rods work with stock pistons in a 250 block or perhaps a deepper dish in some of the forged TRW's that are already being made there always on Ebay and machining a .02 in dish in them doesn't seem like it would hurt too bad.
thanks,
Keep Sixn'
would 6 in or 6.02 in rods work with stock pistons in a 250 block or perhaps a deepper dish in some of the forged TRW's that are already being made there always on Ebay and machining a .02 in dish in them doesn't seem like it would hurt too bad.
thanks,
Keep Sixn'
David, we have a V/SA '72 Maverick. Thinking about assembling a second engine for next season. The current one was purchased along with the car and although it has performed reasonably well and has not suffered any parts failure, we would like to see if there is additional potential in certain areas. We have managed to run 15.75 on the 15.80 IHRA index. There will be other areas for improvement as well, but having a spare engine is always a plus. (The current one would be the back-up)
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