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Rollmaster Timing kit Opinions

Started by _greenmachine215_ , Jan 13 2006 09:54 PM

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6 replies to this topic

#1 _greenmachine215_

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Posted 13 January 2006 - 09:54 PM

Hey all,

Ive just brought a Rollmaster Adjustable timing kit with the 9Keyway crank sproket
It has incriments of 2 and there are 4advance 1 zero 4Retard

Im going to be running this on my 253 witch is being built, I have the Crane CH304 Cam(still hydraulic)
yella terra heads mild work, big valves,double springs ect, This cam doesn't compress the valve springs.
im still running a standard bottom end but fresh, torker maifold, Behind is an aussie 4spd to a 3.55 diff ratio

Now ive been told by numerous race shops that i should run at 2degrees Retarded
some say leave it at zero (witch really to me defeats the purpose of this kit)
some say advance it by 2degree's

Now i wont be out for top end, Down low is what i want and Tourqe as ill be taking this to the drags for some fun in my Hatch

WHO HERE could give me some advise or opinons on witch way to go about this
Or should i get the Dial indicator onto the engine and try figure out what is best?

Thanks in advance

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#2 _J&S Racing_

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Posted 13 January 2006 - 10:16 PM

Get it dialed in by a pro, i did with mine and well worth it take no chance as you don't want to have to do it again. Mine was 3 degrees advanced with a 286 crane cam L34 heads big valves and triple springs etc, etc.

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#3 _[BOTTLEDUP]_

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Posted 14 January 2006 - 11:34 AM

Sorry Green, but 253, Crane 304 and torque do NOT belong in the same sentance.

Degree the cam in properly with a degree wheel and a dial indicator. The easiest method if you have the specs is to use the 'inlet lift at TDC' method. For more torque you should advance the cam, as it closes the intake valve earlier and builds cylinder pressure.

If that sounds like jibberish get a professional to help you.

IMO a CCH304A is waaay too big for a 253, the car would be faster with a H264 or H276.

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#4 Struggler

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Name:Andrew or AJ
Location:Canberra A.C.T.
Car:UC Sedan
Joined: 08-November 05

Posted 14 January 2006 - 04:28 PM

Sorry Green, but 253, Crane 304 and torque do NOT belong in the same sentance.

Couldn't have said it better myself.

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#5 _greenmachine215_

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Posted 14 January 2006 - 05:36 PM

I sat down with the owner of a race shop, we spoke it over and he said this cam Would be extremely big, rough idle ect, He was running almost the exact specs of my engine in his LJ With the 253 same cam ect and advanced it 2degree's and was averaging 11.8 down the qtr mile, I know that my hatch would never do them times with this engine as his was a dedecated drag that was built on a tight budget.

The cam's in now, advanced 2degree's Spose ill just have to wait and see how it goes, Ill be sure to let you's know

Thanks fella's

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#6 _82911_

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Posted 14 January 2006 - 07:30 PM

Don't wanna sound like a smart arse.....
BUT I think someone is having a big lend of you..
A 253 running 11.8 for the 1/4?
Wot's it in a go-kart?
13.8 is more believable.

Cheers Greg..

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#7 _JNR_ATE_

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Posted 15 January 2006 - 03:34 AM

couple of dial indicators will sort out dialling in your cam, i run 2 degrees advance on my 296 clive cam out of my hotty 308. very nice.
Be sure to dial it in properly cause it can be a gain of horsepower/torque you didnt know was there

cheers
JNR_ATE