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Author Topic: rod length and counterweight to piston clearance  (Read 2462 times)
95GTspeeddemon
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« on: March 11, 2017, 12:02:56 pm »

4.00 stroke, 6in h beam, 1.425 c/h piston
will a internal balance 4340 rpm, scat, eagle, or k1 throw clear this combination?
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95gt, stock forged 302 shirtblock, canfield 195's, canfield efi intake; efi sheetmetal elbow, xe258 (208/216 .550), 90mm accufab TB, 69mm gt45, 3in cold side, a/a intercooler, water injection, ba5000 maf, 80lb injectors, moates quarterhorse, stock manifold modified & a log manifold, twin 2in up pipes, 60mm wg, 3.5 dp dumped, 14psi, 3.27s, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600, stock flywheel, ram replacement pressure plate and kevlar/organic disc. 450rwhp 12.39 @ 123.5mph 3400lbs
Outlaw Bill
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« Reply #1 on: March 11, 2017, 07:09:29 pm »

4.00 stroke, 6in h beam, 1.425 c/h piston
will a internal balance 4340 rpm, scat, eagle, or k1 throw clear this combination?
Why the tall the piston and short rod?.
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95GTspeeddemon
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« Reply #2 on: March 12, 2017, 12:27:58 pm »

to use OTS parts. keeping the compression low enough for boost on pump gas (9:1).
i need to call a couple piston manufactures and see if they have 1.3 c/h pistons instead with a .300 top ring height.
a 1.3 c/h -26cc piston, 6.125 rod and 4.0 stroke puts me at .075 in the hole and 9:1.
the rod is just connecting the two... thats if it will clear. it seems all the cranks specify a 6.2 or longer rod for 4.00 stroke... is it because the throws are so long?
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95gt, stock forged 302 shirtblock, canfield 195's, canfield efi intake; efi sheetmetal elbow, xe258 (208/216 .550), 90mm accufab TB, 69mm gt45, 3in cold side, a/a intercooler, water injection, ba5000 maf, 80lb injectors, moates quarterhorse, stock manifold modified & a log manifold, twin 2in up pipes, 60mm wg, 3.5 dp dumped, 14psi, 3.27s, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600, stock flywheel, ram replacement pressure plate and kevlar/organic disc. 450rwhp 12.39 @ 123.5mph 3400lbs
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« Reply #3 on: March 12, 2017, 12:37:15 pm »

Do you have a 69/70 block or are you using one that has already been decked a lot.

When using the common 1.28/6.2 combination, is still necessary to deck most factory blocks a decent amount to achieve zero deck.

And I'd be careful using excessive piston to deck clearance to reduce compression, you may actually hurt yourself. Even with a power added, I'd try to keep the piston to head clearance below .085. And the power added is the only reason I would run that much.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
95GTspeeddemon
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« Reply #4 on: March 12, 2017, 12:46:33 pm »

74 block, its .030 already and needs to go another .010. deck has not been checked. it may have been decked, no idea.
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95gt, stock forged 302 shirtblock, canfield 195's, canfield efi intake; efi sheetmetal elbow, xe258 (208/216 .550), 90mm accufab TB, 69mm gt45, 3in cold side, a/a intercooler, water injection, ba5000 maf, 80lb injectors, moates quarterhorse, stock manifold modified & a log manifold, twin 2in up pipes, 60mm wg, 3.5 dp dumped, 14psi, 3.27s, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600, stock flywheel, ram replacement pressure plate and kevlar/organic disc. 450rwhp 12.39 @ 123.5mph 3400lbs
juiced coupe
Six figures worth of don't give a f*ck
Global Moderator
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #5 on: March 12, 2017, 12:58:56 pm »

Check with Woody, his pistons are custom made by Wiseco.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
woody
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« Reply #6 on: March 12, 2017, 07:10:37 pm »

6 inch rod is a no no 99% of the time, this is why you NEVER see them being used. Dont reinvent the wheel. Use a 6.200 with a 1.280. My wiseco piston regardless of what you need for ring land will handle way more than your block. I use them at 25-28lbs religiously. I have a 32 and 36cc dish with a 1.2-1.2-3.00mm Steel nitrided top ring, napier second ring package
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95GTspeeddemon
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« Reply #7 on: March 12, 2017, 09:38:06 pm »

10-4.
should make it easier to zero balance too.

whats the rpm crank you sell able to handle safely hp wise?
6500 and 800hp is where i would like to be.
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95gt, stock forged 302 shirtblock, canfield 195's, canfield efi intake; efi sheetmetal elbow, xe258 (208/216 .550), 90mm accufab TB, 69mm gt45, 3in cold side, a/a intercooler, water injection, ba5000 maf, 80lb injectors, moates quarterhorse, stock manifold modified & a log manifold, twin 2in up pipes, 60mm wg, 3.5 dp dumped, 14psi, 3.27s, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600, stock flywheel, ram replacement pressure plate and kevlar/organic disc. 450rwhp 12.39 @ 123.5mph 3400lbs
woody
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« Reply #8 on: March 12, 2017, 10:32:13 pm »

more than any stock block, same crank that ohio crank uses and same crank that lunati sells. RPM was just the first to bring it to market, now its sold under several names. I also have them over 1200 hp in dart blocks.
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331-347 Short Blocks 2099.00 and up
408-418-427 Short Blocks (F4 Roller Blocks Standard) 2399.99 and up
Dart Shorts 4199.00+
D.I.Y Shortblocks 1799.00

FordStrokers.com

Make sure you get your information from the internet gurus that haven't built SHIT, they did sleep at Holiday Inn last night, and we have a few of those gurus right here on this forum. Smiley
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