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Author Topic:   355 6inch rod or 383 motor
LUBEGUY07
Dirt Maniac

Total posts: 156
posted December 28, 2002 08:13 PM
ok were in the process of building motors for next season. We already got 2 355 9 to 1 compersion motors done and are going to build one "Big Motor" for specail races. Whats better to build a 355 with 6 inch rod or a 383? We have a 360 cube and 9 to 1 compersion rule, but they never check anyone. Whats the better choice, i run on 4/10 3/8 and 1/2 mile tracks,thanks in advance

stockcar5
Dirt Full Roller

Total posts: 63
posted December 28, 2002 10:08 PM
build a 6" rod 383

luke

sixwillwin
Dirt Freak

Total posts: 215
posted December 28, 2002 10:31 PM
383, 5.7 rods, ....hey dont beat me up everyone, tried all combos and to me they aint no difference with the 6.0 rods. Alot of people say the 5.7 adds torque and the 6.0 adds HP, my tracks need the torque more than the HP.........

racer17j
Dirt Forum Champ
Total posts: 1565
posted December 29, 2002 12:12 AM UIN: 54865418
what ever you build don't pull a jamie odor and pull ahead by a straight in the first 5 laps then they might check you then you'll have to buy a set of stock car tires lol anyway it would be alot easier to get away with a 355 and bump the compression up then you don't have to hide a balence plate or spent the time and money to have it internaly balanced thats how that other 7 car won his feature this year with his 12:1 stock car motor

DMS CEO
Dirt Freak

Total posts: 212
posted December 29, 2002 11:44 AM
355 six inch rod motor for heavy car on linger tracks have worked for me, now for my money in a modified is a 383 and hang some middle of the road gear on it. My engine builder of the 355 said when I asked him what gear he wanted me to run he said,"whatever the f-word gets it to the other end before those other idiots"

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Nice guys finish last!!!

LUBEGUY07
Dirt Maniac

Total posts: 156
posted December 30, 2002 09:41 PM
ok thanks guys were going to try a 383 just found a used scat crank for a 383 for cheap, modifeid guy selling out.Is it better to have rotating assembly internally balanced or just run those cheater balancers


rfb320
Dirt Full Roller

Total posts: 43
posted January 01, 2003 10:54 AM
the six inch rod is better than the 5.7 rod because it will give you a slower piston speed at the same rpm's and that is a good thing.the problem with the six inch rod is that you can run into alot of clearance problems on the block and cam. you usually end up doing alot of grinding.but if you take your time and do it right the six inch rod is a better choice.

outlawstock17
Dirt Forum Champ
Total posts: 620
posted January 01, 2003 11:40 AM
yep, longer rod is better. scha-wing!

[This message has been edited by outlawstock17 (edited January 01, 2003).]

66jj
Dirt Freak

Total posts: 352
posted January 01, 2003 01:03 PM
eagle sells a new internal 4340 beautifull crank for 399.99 only 50 lbs also...

stay away from used unless its a buddy and like new, you cna get a cast scat internal bal for 6 in rod 383 for 200 online..

gofaststuff.com ive bought lots from them allready all good and fast delivery... call and ask for racers auction pricing...

jeff pm me if you need more contacts or info.

LUBEGUY07
Dirt Maniac

Total posts: 156
posted January 01, 2003 02:57 PM
ok thanks, jeff
if u ran them internal balanced cranks then can u ran a 350 balancer and flywheel?

Speed Racer X
Dirt Full Roller

Total posts: 61
posted January 01, 2003 08:05 PM
quote:
Originally posted by LUBEGUY07:
ok thanks, jeff
if u ran them internal balanced cranks then can u ran a 350 balancer and flywheel?

We are in the process of building a 6" rod 383 using the Scat 9000 series crank. We want to go internal balanced, but everyone we have talked to, laughed at the internal balance part. My machine shop has dirt late model engines using the Scat 9000 crank with no problems in durability, but they must be balanced and external with save lots of $$$. One they did balance internal took 4 slugs of mallory metal a $50 each, almost the cost of the crank. I have the 2003 Scat cataloge, this is a quote from the price sheet concerning the internal balanced 9000 series cranks, "Note: Balances at 1830 to 1850 grams with standard weighted flywheel, neutral standard balancer and one piece Mallory in #1 counterweight." Just my 2 cents for what it's worth. Happy New year!!!

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