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Re: Cast Crank and 10 to 1 pistons
[Re: cornet684me]
#1109961
11/15/11 04:18 AM
11/15/11 04:18 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
does anybody have the part number & name of pistons for the 10 to 1 pistons that i wld need to go with, looks like i wld want just to swap out the pistons that i have for the stock replacement 10 to 1 compression and not balance the motor.
Closest thing would be a set of trw2355's. Besides the smogger 440 pistons, the only other stock type 440 pistons being produced will only give you around 8.5 compression or so where those smogger pistons will be closer to 7.8.
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Re: Cast Crank and 10 to 1 pistons
[Re: cornet684me]
#1109963
11/15/11 09:04 AM
11/15/11 09:04 AM
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Joined: Jan 2003
Posts: 74,973
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,973
U.S.S.A.
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Quote:
for 800.00 it was a deal, the heads are completely rebuilt 906, it is a 69 block with 906 heads, that is why i bought it, for the money i cannot go wrong
Wasn't that good of a deal if you have to replace the pistons ...  ...
That said here is the rub , WHAT DO THE PISTONS in the engine weight NOW ??? You have an external balance engine , balance is critical .
Here is your main problem the true 10.0 piston, the piston that came in the 68-69 440's IS NOT REPRODUCED , you have 906's so that is the only piston that will get you close to the OVERSTATED 10.0 from the factory. The 2355 is the 70-71 6pk piston and in 70 at least the engine had a HIGHER than 10.0 rating from the factory , that replacement piston I am told is 40 grams heavier than the piston it replaces.
Good Luck in your quest to fix your good deal ...
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Re: Cast Crank and 10 to 1 pistons
[Re: JohnRR]
#1109964
11/15/11 09:23 AM
11/15/11 09:23 AM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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If it's a street driver, you might want to leave the smogger pistons, and put the money into cam and carb. These motors can make tons of torque. That's what's needed for street fun. Just a suggestion.
I have mechanical Aptitude.
I can screw up anything.
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Re: Cast Crank and 10 to 1 pistons
[Re: R/T1968R/T]
#1109968
11/16/11 03:16 PM
11/16/11 03:16 PM
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Joined: Jan 2003
Posts: 74,973
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
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U.S.S.A.
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Quote:
KB 236 is exactly what you need.
R.
That's a step head , quench dome, piston. If he doesn't have the money to balance the rotating assembly he certainly doesn't have the money to make those pistons fit properly. The questions elude that he doesn't have the skills, or equipment available, to do it himself either.
Quote:
Factory 440 pistons (10:1) weigh in at about 867gr. the later smog motors are in the 850 range. TRW (Speedpro) 2355 are 872gr and 2266 876gr.
When and where did you get the numbers for the 2355 ?
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Re: Cast Crank and 10 to 1 pistons
[Re: dogdays]
#1109970
11/16/11 10:11 PM
11/16/11 10:11 PM
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Joined: Jan 2003
Posts: 74,973
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
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Quote:
"Quench dome" height is 0.075". Take away the 0.015" the piston is below a stock deck, and the 0.020 of a steel shim gasket and the dome protrudes 0.040".I can't see that as being any worse than a flattop that lies at deck or below. Is it optimum? If he's lucky, but the heads are going to have to have been milled quite a bit for there to be any interference problems.
Piston weight of the 236 is 775 grams with a 190 gram pin. It's a lot heavier than I would suggest, but the OP is trying to get to 10:1 and this piston will do it. And a difference of 15-25 grams is going to be "good enough." Probably not a lot worse than Mopar original balance jobs.
So I stand by my recommendation.
R.
PS: The word you were looking for is "allude." Elude means to escape something.
I stand by elude , he is trying to escape both doing it right and spending money ...
P.S. one is also assuming the heads haven't been cut , are straight and equal depth across the entire head , I also stand by the assumption he would be in over his head.
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Re: Cast Crank and 10 to 1 pistons
[Re: RBDART1]
#1109972
11/18/11 05:05 AM
11/18/11 05:05 AM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,161
CT
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If you dont want to bore it or rebalance it just swap in some earlier high compression slugs. It will be more like 9.5:1 but it'll cost you 50 bucks for some old pistons.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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