speedaholic

Im working on a 26' Corsa I picked up. Has a 502 with dart steel heads, dart intake, holley 950cfm, CMI race exhaust and God only knows what else. Although I havent even pulled the valve covers yet, I was told its a full roller motor. I gave it a quickie set of plugs and cap and rotor and fired it up. It sounds incredible! I did a compression test cold and it was between 152 and 165. My question is it sounds real loud. Not the exhaust but the engine itself. Now this is my first experience with a roller motor. Are the inherently louder? Thanks Ray

MILD THUNDER

iTrader: (3)

Maybe it has a gear drive instead of a timing chain.

jeff1000man

Do you mean loud like a lot of internal rattling and clanking. SOLID roller engines are loud because the rockers have lash in them and the rockers rattle. If it is a real high pitch whining sound, then it might have a gear drive instead of a timing chain. Those are the only things that come to ming off the top of my head that you might be refering to.

speedaholic

No there is no whine noise. Its more like a klack ady klack. Definitely sounds like its coming from the top half. When I was told it was a full roller motor I was told it was not just the roller rockers. I assume its all solid lifters. The noise is bearable. Just wasnt sure if it was something I should be concerned with. All in all the motor sound like a top fuel motor. Has a ton of cam and the throttle response feels great. Cant wait to get the steering working so I can get this thing wet. Thanks! Ray

jeff1000man

You need to find out what is in it, comp ratio, cam, where are you supposed to set the timing at? Are you running wet or dry exhaust?

Sounds like you have quite a bit of comp in there. If they are clicking in unison, then that is what a solid roller sounds like. If they are not in unison, then you need to re adjust them again. Solid roller engines need to be adjusted periodically as the lash does move on those engines.

If that is a high comp engine and you aren't giving it enough octane then it will break pretty quick. If it has to much cam and you have a wet exhaust you could have a reversion problem.

Unless it was a free engine, I would want to know what was in it, so I didn't screw it up. Even if it was free, you waste a lot of time getting it all set up etc.

Fenderjack

iTrader: (2)

Dry or wet exhaust?? Solid roller or hydro roller.. If it has a big lift cam in it, it could be the valve train, from more seat pressure, just in general harder on the train vs a stock cam. Need more info on it..

John jr

speedaholic

I have the original builders number. I will try to reach him and see if he has any of these answers. I definitely don't want to hurt it. here is a pic of the motor.

jeff1000man

Are those headers tightning down with those valve covers. That might be some of the noise you are hearing.

Usually you need a notched valve cover with that header.

speedaholic

Thats a good question. I do know they are right up against the valve cover. Who makes a notched cover for that?

jeff1000man

Lots of places. I even have several sets of good used ones if you need to buy some. They have other builders names on them, so I only use them for testing etc.

Sure would be nice to know what is in that engine?