Blown Alky Gear Drive Or Timing Chain ?
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Blown Alky Gear Drive Or Timing Chain ?

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    Senior Member Blown to the Bone's Avatar
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    Default Blown Alky Gear Drive Or Timing Chain ?

    I'm interested in getting some opinions, and, or experiences on running timing chain's in a blown alky engine...

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    I used to run Cloyes and the chains stayed tight. I would say up to about 5 years ago. I used a Cloyes in my deal and after 5 passes at a race it was stretched to Hell. I could even feel the slack when rolling the motor over and running the valves.
    I went back to gear drive.
    2 years ago I built a 541 N/A. The "new" deal was using an Iwis chain setup that was made in Austrailia as I remember. Scoggin Dickey sold them. Anyway....that deal made a season but the chain was sloppy end of season. Hell it could have stretched out immediately but did not see the boat again till the guy wanted to go blown gas.
    5 passes at Red bluff..8 passes at Phoenix....I feel slop in the chain.
    Needless to say...I am all done with chains.

    Gofastracer has had good luck with the Pete Jackson gear drives. I run Summers, Donovan, Milodon. Erson is the same gears as a Mildon. There's also a copy of the Milodon....have not tried that but see no problem with it visually and it is a bunch cheaper. Perhaps someone can remember the name of that deal.

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    steelcomp was here
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    Kind of depends on the power level and rpm you're at. My only real experience is with RCD stuff...very expensive, but the beat stuff available. For a chain set-up, I'd go with a Rollmaster and get the Iwis chain. That's a good set-up. I don't know about belt drives on blown alky...that might be a consideration. For gear drives, don't use anything with a floating idler gear like the Peat Jackson. Milodon makes some decent parts that aren't too expensive.


    Edited to add...posted this before I red Fiat's input. The Iwis is suposed to be the Chit. I had the Rolon chain in my last engine and it showed no signs of stretch, but not near the abuse of an alky engine.
    Last edited by scott foxwell; 01-05-2008 at 12:18 PM.

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    Senior Member motormonkey's Avatar
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    Gear drive. Any time you have a high valve and spring load, ect. My short answer .

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    What iritates me is...Cloyes had it...I have an old cloyes on a 509" blown alky deal in a hydro. Same chain setup we ran for 6 years on blown gas. Still nice and tight like we just put it on. An alcohol altered roadster here in town....same deal. That was a Reynolds chain. But something happened somewhere in quality because it is no more.

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    steelcomp was here
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    Quote Originally Posted by Fiat48 View Post
    What iritates me is...Cloyes had it...I have an old cloyes on a 509" blown alky deal in a hydro. Same chain setup we ran for 6 years on blown gas. Still nice and tight like we just put it on. An alcohol altered roadster here in town....same deal. That was a Reynolds chain. But something happened somewhere in quality because it is no more.
    I have the original chain off my BBC boat engine that had a blower on it before I bought it. Probably installed at Harman Marine in 1980. Same thing. Fits like new. All it says on the chain is "made in USA". Go figure.

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    Senior Member Blown to the Bone's Avatar
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    just went an opened a brand new comp cams .005 under set # 3110-5 lower gear says made in USA top gear says 3110A-005 chain says JAPAN, DID06B
    also have new old stock cloyes .005 under set dated 1993 it has a Renold chain
    Also have a PBM 8991TA fast adjustable set I was told they are made by Rollmaster the chain says made in USA I thought Iwis chain was made in
    Germany?
    I have a chain in my blown gas deal, Last time I had it apart it looked good enough to run it again but it is also one of the old Stock Cloyes .005 under set
    Thanks Guys I appreciate the feed back.
    probably buy a gear drive just to be safe. donavon, milodon, or keith black,
    just need to decide witch one is best.

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    Quote Originally Posted by Blown to the Bone View Post
    just went an opened a brand new comp cams .005 under set # 3110-5 lower gear says made in USA top gear says 3110A-005 chain says JAPAN, DID06B
    also have new old stock cloyes .005 under set dated 1993 it has a Renold chain
    Also have a PBM 8991TA fast adjustable set I was told they are made by Rollmaster the chain says made in USA I thought Iwis chain was made in
    Germany?
    I have a chain in my blown gas deal, Last time I had it apart it looked good enough to run it again but it is also one of the old Stock Cloyes .005 under set
    Thanks Guys I appreciate the feed back.
    probably buy a gear drive just to be safe. donavon, milodon, or keith black,
    just need to decide witch one is best.



    Just bought a Cloyes for the sub............Had "IWIS" stamped all over the
    chain. HMMMMM.

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    Yeah. You don't know if that is an improvement or whether Iwis was the low bidder.

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    Quote Originally Posted by Fiat48 View Post
    Yeah. You don't know if that is an improvement or whether Iwis was the low bidder.
    I was hoping it was from so much "Flak" about stretch. Had to be an improvemnt fom stock. I'll let you know a 100,000 from now.

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    I think that with the high spring pressures we run and the rpm....we kill them. I always did extra oiling for that area also. But once upon a time....a Cloyes and a Reynolds chain would hold up.

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    Quote Originally Posted by Fiat48 View Post
    But once upon a time....a Cloyes and a Reynolds chain would hold up.
    Yeah, that was back in the day when stuff was made good!..

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    Quote Originally Posted by steelcomp View Post
    For gear drives, don't use anything with a floating idler gear like the Peat Jackson.
    Please explain why??????????.. My Jackson is 26 years old and it has 15 years of racing in a car/boat the rest in a hot rod boat, and it's still like it came out of the box and never rebuilt!.. Not sure about a blown motor, but a mild application I wouldn't be afraid to use one!...

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    Quote Originally Posted by GoFastRacer View Post
    Please explain why??????????.. My Jackson is 26 years old and it has 15 years of racing in a car/boat the rest in a hot rod boat, and it's still like it came out of the box and never rebuilt!.. Not sure about a blown motor, but a mild application I wouldn't be afraid to use one!...
    I have to chime in hear, I've had a few customers that had them.
    put a timing lite on them and the timing is jumping all over the place, setting the timing is a guess at best. so if the timing is doing that so is the rest of the valve train, and that can't be good, just my opinion.

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