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Cam gear offset bushing


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#1 boostinmini

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Posted 20 March 2019 - 07:29 AM

Just wondering if any one has ever used offset bushings in there g54b to adjust cam timing?

Looks like a simple solution if they fit





#2 kev

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Posted 21 March 2019 - 11:24 AM

Yes, a former member, Richie Rich, did just that years back with off the shelf comp cams offset bushings.  Most of the adjustable cam gears made up for these engines are two piece.  Most modify the factory gear by adding slots and opening up the center hole to accept an aluminum disk with tapped holes.  This one was obtained from an former member in canada, Shawn Silva

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#3 boostinmini

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Posted 21 March 2019 - 12:38 PM

That's awesome, i am thinking that i am going to try a bushing...i would like to be able to drill it with out removing the gear??  Looks pretty basic if you can drill straight.

Seems like the gear might be a little tricky to remove on an assembled engine

#4 speedyquest

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Posted 21 March 2019 - 12:42 PM

Honestly, the gear isn't hard to take off and you definitely do NOT want to be drilling anything while attached to the engine. It would be almost impossible to ensure you don't get metal shavings all over.

Edited by speedyquest, 21 March 2019 - 12:45 PM.

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#5 boostinmini

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Posted 21 March 2019 - 12:47 PM

Definitely think I can drill that without making a mess in the engine that's not a concern but you think it's pretty easy to swap in a gear on an assembled engine?

#6 speedyquest

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Posted 21 March 2019 - 12:48 PM

View Postboostinmini, on 21 March 2019 - 12:47 PM, said:

Definitely think I can drill that without making a mess in the engine that's not a concern but you think it's pretty easy to swap in a gear on an assembled engine?

It definitely is. I've done it. And in a few weeks I'll be doing it again when I swap over to an adjustable cam gear, cam, and mechanical rockers. Does your head still have the cam gear shelf installed? Basically just unbolt the cam gear, set it there, and your fine. Taking it off out of the engine is fine too, just ensure you don't let slack into the left side of your timing chain.

Edited by speedyquest, 21 March 2019 - 12:49 PM.

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#7 boostinmini

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Posted 21 March 2019 - 01:17 PM

Still have the cam shelf!  There is enough slack in the chain to get the gear or with the head on?

#8 speedyquest

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Posted 21 March 2019 - 01:18 PM

View Postboostinmini, on 21 March 2019 - 01:17 PM, said:

Still have the cam shelf!  There is enough slack in the chain to get the gear or with the head on?

Yessir :)

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#9 boostinmini

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Posted 21 March 2019 - 01:34 PM

Do i have to get down the timing cover and push the tensioner in?

#10 speedyquest

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Posted 21 March 2019 - 01:44 PM

View Postboostinmini, on 21 March 2019 - 01:34 PM, said:

Do i have to get down the timing cover and push the tensioner in?

Not that I remember and its because the cam gear shelf is a bit lower than the cam gear while its on the cam. As you pull the cam gear forward off the cam make sure to also hold chain so it stays up. Then lower the gear out of the chain. Again make sure to keep tension on the chain so it doesn't become loose on the crank gear.

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#11 mikec

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Posted 21 March 2019 - 11:06 PM

One thing to remember with "offset" pins: the stock StarQuest pin ties THREE things together: the camshaft itself, the sprocket, and the stubby shaft that drives the distributor.  Make sure your offset pin is long enough to reach all three pieces - most are designed to connect sprockets to camshafts only and would be too short for StarQuests.  Making the cam sprocket two-part and adjustable as Kev's picture shows allows the stock style roll pin to handle all three pieces.

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#12 boostinmini

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Posted 22 March 2019 - 12:37 AM

Thanks Mike c very true, i have edis so my distributor gear is just along for the ride

I do have a actual adjustable gear, was just thinking it might not be possible to do in a assembled engine



#13 ucw458

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Posted 01 April 2019 - 10:31 AM

I used chevy offset bushings on an aftermarket cam I used to run in my SQ.  There are 5 issues to consider.

1 the pin has to be long enough, stable and strong.  I used the cut off end of a 1/4" drill bit and tack welded it to the dizzy gear.
2 you will have to drill the cam and dizzy gear holes out to 1/4".  And the cam gear to accept the bushing.  Make sure this is the way you want to go because it isn't reversible.
3 the bushing is meant for a different engine.  It will NOT give you fine adjustment.  A 2 deg bushing will give you around 10 deg of movement.  I had to have the timing chain 1 tooth off then a bushing to bring it back just to get the proper adjustment.
4 you MUST degree the cam with this method after every bushing change to see where the cam is.
5 a bushing change will require the cam gear to be removed.  A proper adjustable gear does not need to be removed to adjust.

Would I do it this way again, no.  I would buy the proper adjustable cam gear.



Also you must put a 1" bar down the timing cover between the chain where the tensioner is.  If you don't then when you remove the gear the tensioner will pop out and you wont be able to get the gear back on until you compress the tensioner again.  I used a large file wrapped in electrical tape.  A 1" wide wood stick would work too.
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#14 Tim_C.

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Posted 08 April 2019 - 12:11 AM

I'm with ucw458 on this one. I've used a bushing before. It worked for a while, but after about 20K miles, I took it apart to put another cam in, and the bushing hole was worn larger.
It just seems too much hassel and potentially harmful. I would do an adjustable gear, or not at all.
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#15 Turbo Cary

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Posted 08 April 2019 - 11:55 AM

Adjustable cam sprocket is the way to go. Get yourself one, a 9" degree wheel, make your own piston stop, and a get a dial indicator. Degreeing the cam isn't difficult to do and you'll actually have it where it needs to be.




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