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Author Topic:   aluminum rods
thebomb
Dirt Maniac

Total posts: 149
posted February 12, 2005 11:31 AM  
a buddy of mine works on saturdays, so hes going to be running a really limited schedule, he was asking me if his new motor if he should put some aluminum rods in it, 3300pound camaro, 360 rule, thanx for any help

sdhnc29
Dirt Forum Champ
Total posts: 934
posted February 12, 2005 03:24 PM  
I would not, or he might be running an even more limited schedule. I have personally never seen an aluminum rod circle track engine that made it past a few races.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
http://www.hendrensracingengines.com

goinrcn44h
Dirt Freak

Total posts: 205
posted February 12, 2005 08:50 PM  
There are 6 left over out in the garage from one that my dad and his builder tried makin work roughly 20 years ago. one rod looked like silly putty that had been stretched too far..... the rest wasnt pretty either....
44H

awkwardjeff
Dirt Forum Champ
Total posts: 562
posted February 12, 2005 09:23 PM  
I've got a aluminum rod 406 that has about a dozen races on it, it sits in the corner as a spare. The ONLY reason I built it was because I got the complete rotating for $500.

UNLESS he is getting a heck of a deal I wouldn't go down this path. Fit up is a lot of work. Bearings must be pinned, and rod bearing clearance will need to be .003-.0035 then the side clearance needs to be .045 minimum. then you also need to leave the pistons down the bore .012 to allow for stretch. All these clearances are because aluminum expands at twice the rate of steel, so to have the same clearance at operating temp you need extra clearance cold. This motor will NOT tolorate revs when cold, the clearance will be too great and break parts if you rev-tune the motor cold. I didn't even mention the clearance on the oil pan rail or the cam.......this also becomes a problem with aluminum rods......

thebomb
Dirt Maniac

Total posts: 149
posted February 13, 2005 02:10 AM  
thanx for the replys guys, so what do you think, some eagle Hbeam

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