Thread: 3 way crank gear

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heres a subject for you guys i just purchased a double roller chain and gear set for my small block chevy it has three notches in the crank gear 4 degrees retard 4 advance and straight up timing whats the advantages and dis advantages what do you guys use

Originally posted by lildebbie1111
heres a subject for you guys i just purchased a double roller chain and gear set for my small block chevy it has three notches in the crank gear 4 degrees retard 4 advance and straight up timing whats the advantages and dis advantages what do you guys use

depend on what youre looking for. 4 degrees adv. will give you more bottom end, amd 4 retard will hurt your bottom power. i al ways run them stright up.

Well if u like taking it apart and putting it back together, u can do some research on what works besr for your engine. I usually go straight up for street ,but with some cams u go advanced and maybe make some real low end torque. Which would take some of the top end if u doing short track racing.

Like the other guys said,Straight up works best in "most" cases.

BG

the nice thing about these sets is strait up should mean strait up...assuming its a quality set. a stock timing set is generally advanced 6 degrees

I bought a multi keyed timing chain set with the intension of precisely timing my cam while using a degree wheel.It was disapointing when I realised that I could not dial in my cam to the exact manufacturers specifications due to the limitations of the this design.In the end I ended up choosing the "straight up" keyway knowing that was the closest I could get (1.5 deg. adv.) to the manufacturers specs.If I had the money I would go for an infinitly adjustable timing chain.Good luck!

So you use the crank keys for rough adjustment and offset bushings for final dial in.And the the #6 cyl.(on chevy) has the same timing as the #1 cyl.?

Thanks for the good info.

I've done both retarded and advanced. staight up is the only way to go

If your cam is the correct grind to start with you should go straight up.

Degreeing the cam in on #1 and checking it on it's opposing cylinder is still the best way to set up a cam. Just hanging the gears on the shafts is trusting too many different machinists on too many different parts. It's not uncommon for a cam to be off 4 or 5 degrees from what the manufacturer's card states the centerline is. Offset keys, sprockets, and or busihings will correct the errors and make the cam perform as advertised.