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Post  racinghabbit on April 19th 2013, 11:06 am

what kind of pistons do you guys use on your race engines???? 12.5 :1 compression.?????? flat top..forged..
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Post  John Myrick on April 19th 2013, 11:08 am

12.5:1 is such a wasted compression as you need race gas anyways, so go to 14:1 or 15:1 and get more power
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Post  69F100 on April 19th 2013, 12:08 pm

it will depend on what size engine you are building to know what piston is needed for that cr
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Post  racinghabbit on April 19th 2013, 1:28 pm

It just a matter of opinion.. If your freshening up a motor and you are at 9.94 compression and there is a simple piston swap to get it up to 12.5... I'll take it ., Not going to spend a ton of money to get to 14....
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Post  dfree383 on April 19th 2013, 1:45 pm

What bore, Stroke, rods and Heads?
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Post  cool40 on April 19th 2013, 1:50 pm

A piston swap cost money however you look at it.if its gona take a custom piston the cost is about the same whatever your compression.you'd like 14.1 Wink
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Post  racinghabbit on April 19th 2013, 1:59 pm

501 cid
6.700 rod
4.14 crank stroke
ported dove- c heads 73cc chamber (just checked at machine shop)
4.390 bore
.015 below deck
.040 head gasket..
current pistons 28cc dish srp154166... 9.94:1 compression.
This is a good running motor just want to fresh it up and get more compression.. NO NEED TO GO BROKE ...

found pistons that are 3cc dish that will slide right in..srp 150725
But i do like good advice.. If i could find a piston that will get me to 14 compression i'd like to have it...
I cant find a lot of options for this motor the way its built... But i might be mission something!


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Post  racinghabbit on April 19th 2013, 2:02 pm

i am running an eagle CAST crank.... can it support 14:1 compression.??
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Post  dfree383 on April 19th 2013, 2:04 pm

Just put a probe FT in it, they a reasonably priced and work great.
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Post  IDT-572 on April 19th 2013, 2:34 pm

dfree383 wrote:Just put a probe FT in it, they a reasonably priced and work great.

X2 To get from 12:1 to 14:1 in this case will be a change from a shelf deal to a custom one. $400 vs $800
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Post  dfree383 on April 19th 2013, 3:09 pm

And zero deck it..... study
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Post  racinghabbit on April 19th 2013, 3:19 pm

I called eagle, they said to stay under 12:1 on there cast crank....
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Post  racinghabbit on April 19th 2013, 3:22 pm

probe doesn't offer a piston to fit
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Post  dfree383 on April 19th 2013, 3:34 pm

http://www.probeindustries.com/Ford_514_3_0cc_Flat_Top_SRS_Pistons_p/14781.htm

These will work fine. Won't need to deck it and will need a little thicker gasket.

Guys have been running cast cranks for years with higher static compression ration, not a problem IMO
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Post  Mark O'Neal on April 24th 2013, 2:14 am

racinghabbit wrote:probe doesn't offer a piston to fit

http://www.probeindustries.com/Ford_514_3_0cc_Flat_Top_SRS_Pistons_p/14781.htm

They're out of stock at the moment.....and the SRP will work fine for what you're doing.

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Post  bbf-falcon on April 24th 2013, 9:04 am

A flat top will not get you 14.1 cr. though. You will need a dome.

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Post  Lem Evans on April 24th 2013, 9:07 am

The cast crankshaft will be happier with a flat top piston..i.m.o.

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Post  racinghabbit on April 24th 2013, 10:04 am

i'm going to use the srp pistons. at 12.5:1 compression... not going to push it... I like my motor the way it was at 9.5:1, so i'm pretty sure its only going to be even more enjoyable.......
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