Timing chain VS gear
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Timing chain VS gear

  1. #1
    classic hot boater Orange Peel's Avatar
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    Thumbs down Timing chain VS gear

    Pros and cons of each??
    Going to be running 454 with blower if it matters.
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  3. #2
    gn7
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    what gear drive? Dual Idler type? Better off with a chain!!!



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    Senior Member 78COLE's Avatar
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    I ran a Pete Jackson gear drive in my last motor(N/A 496) and will never run gear again. The "straps" that hold the idler gears together ended up in the pan and almost cost me the engine. Ruined a nice balancer but the balancer was the only thing that kept it from being worse. Snout of the balancer held gears somewhat in place. Got lucky... motor probably would not have made another pass without grenading it. Just my experience....

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  6. #4
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    Research I just did pointed to best chain setup being Cloyes "Silver colored" chain.
    Don't know who makes it.....says "made in USA" on it. Trying one now in a blown gas deal.
    Tried the IWIS chain deal and after 2 racing seasons on another blown gas 540....had to replace the chain as it had stretched quite a bit.
    The Cloyes Hex adjust with the Reynolds chain bought in 2002 went 5 runs and was totally stretched out and junk.

    My summers bros gear drive is still alive and kicken after 20 years.
    Milodon gear drives and others with idler in the cover tend to shake the cover loose so you have to keep and eye on them.

    Gofastracer (Art) has run Pete Jackson's for years and never had an issue and likes them.
    All I know.

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    Boat Nut sleekcrafter's Avatar
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    Additional harmonics with the gear drive, nothing wrong with a good true roller. Check out the Rolmac timing sets, the chain pre-stretched as a set, instead a 100 foot sections. The gears are CNC machined, and has the Torrington bearing already installed.

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    Senior Member Brendellajet's Avatar
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    I never did get the "harmonics" argument. Its an engine block, all that stuff is connected even if there is a chain...Does the block not transfer crankshaft harmonics to everything touching it?

    I run a Pete Jackson and I like it. I wish it were louder.(cant really hear it over exhaust).

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    Senior Member blown65's Avatar
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    Low RPMs is ok, but Ill stick with Chain and plan on running a belt setup once I'm done spending in other areas. Sound cool is about it IMO.

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    I've ran them on 8000 RPM small blocks, and never once had a problem.
    ( Pete Jackson noisy)




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    I have sold the rollmasters for Years with the IWIS chain designed for them. My engine builder customers have had extremely good luck with the stuff over the years. The IWIS chain for rollmaster is propritary to them as it is pre stretched in assembled sets of links.

    Chris
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  12. #10
    steelcomp was here
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    Quote Originally Posted by cstraub View Post
    I have sold the rollmasters for Years with the IWIS chain designed for them. My engine builder customers have had extremely good luck with the stuff over the years. The IWIS chain for rollmaster is propritary to them as it is pre stretched in assembled sets of links.

    Chris
    Rollmaster has also used the Rolon chain in the past. Said to be inferior to the Iwis, but I used one in my 820hp 467 (N/A) and it finished it's third season w/no issues. The one in the blown 489 was the Iwis.
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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by Orange Peel View Post
    Pros and cons of each??
    Going to be running 454 with blower if it matters.
    If you're not running a cam driven fuel pump, my vote is for a high quality chain (or a belt drive if you have the $$). If you are running a cam driven fuel pump, a high quality gear drive... Milodon or equivilant, single idler gear seems to be the "choice of champions"
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

  14. #12
    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    There is a time and place for everything and this includes gear drives. However, I am of the opinion that unless you are constantly playing with camshaft timing and/or complete camshaft changes between rounds at the track, then you don't need one. From this perspective it would mean that 99.8% of engine builds don't need a gear drive and a chain will suffice.

    And don't even get me started on the useless bling factor (eg, "I like the way they sound, " etc. )

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  15. #13
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    Quote Originally Posted by David 519 View Post
    If you're not running a cam driven fuel pump, my vote is for a high quality chain (or a belt drive if you have the $$). If you are running a cam driven fuel pump, a high quality gear drive... Milodon or equivilant, single idler gear seems to be the "choice of champions"

    X2!!!!

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    JESEL

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