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Old 11-11-2012, 07:44 PM
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383 stroker quick help

Bought a 935056 scat crank for a 383 im building and put the crank in and one piston/rod combo and on the down stroke the piston bottom hits the cranks counter weights. 5.7 rod. nowhere does it say on summit website that it has to be 6.0 or longer rod and was wondering if i can just grind off the excess to make it pass and go from there or should i return the crank and get a different one that will work? probe forged pistons. scat 5.7 cap screw rods.
thanks,
Logan

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Old 11-11-2012, 07:53 PM
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The pistons are for 5.7 rods. everything is fine except for the pistons hitting the crank that is the only problem. this is not a kit i bought all of it separately.
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Old 11-11-2012, 10:02 PM
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Quote:
Originally Posted by hcompton View Post
Just ran a google search the crank is for 6.0 inch rods only.
OOOOOOoooooops.....
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Old 11-11-2012, 10:35 PM
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383 stroker quick help

You need to contact Summit Racing asap to return the 400 crankshaft you purchased. This is the correct part number for the crankshaft you need. Scat Series 9000 Cast Pro Comp Stroker Lightweight Crankshafts 935050 - SummitRacing.com. It is reasons like this it is best to buy a complete rotating assembly. I am sure that if you had called Summit Racing to order a rotating assembly with the pistons of your choice they would have made one up. I purchased a rotating assembly with the pistons I chose for my 454 from CNC-Motorsports.
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Old 11-12-2012, 10:50 AM
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Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
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Old 11-12-2012, 01:50 PM
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Quote:
Originally Posted by 69chevyLWB View Post
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Actually whether or not you can get to internal balance with either the SCAT or Eagle crank has everything to do with the weights of the pistons and rods selected and whether or not you're willing to step up to the cost of Mallory metal slugs in the counterweights if the pistons and rods prove too heavy for the counter weight masses. This appies as much to what is advertized as internally balanced or externally. If I were you I wouldn't breath a sigh of relief untill this thing shows up at the balancing shop and they mock it up to see whether it'll balance inside or not.

Frankly for a street engine where the RPMs will seldom if ever hit in the upper 5000's or higher the difference between internal external balance is almost a moot point as on a crank pin to crank pin basis even internally balanced engines are not in balance from pin to pin they mightily depend upon the counterweights at the extreme ends of the shaft to put the assembly into balance as a whole. Therefore, there are substantial out of balance forces working on the inboard mains of 2, 3 and 4. This is why 4 bolt blocks are on the 2,3 and 4 main unless you're looking at a real race block that does 4 bolts on all the mains. So the externally balanced engine only moves some counter weight a little further toward the crank ends by placing the final balance up on the flywheel/flexplate and front damper. This puts a little more load on the number 1 and 5 journal while it creates little or no change to 2,3 or 4.

This is not as simple as the advertisers would suggest by data ommision or inclusion. You're not home free till the balance shop speaks.

Bogie

Last edited by BogiesAnnex1; 11-12-2012 at 02:01 PM.
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Old 11-12-2012, 01:57 PM
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Quote:
Originally Posted by 69chevyLWB View Post
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Measure all dimensions carefully on the Eagle crank. There have been issues.
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Old 11-12-2012, 03:05 PM
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Eagle will tell you what bobweight they balanced the crank to so you can tell if your bobweight is even close. All cranks from Eagle and Scat have to be balanced unless purchased in a kit that is a balanaced assembly.
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