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Cam timing question #455350 08/31/09 09:05 AM 08/31/09 09:05 AM
Joined: Jul 2005 Posts: 1,301 Penna 7 70satelliteguy OP pro stock
70satelliteguy OP pro stock 7 Joined: Jul 2005 Posts: 1,301 Penna	I know that if the cam is installed several degrees retarded that it will move the power band and torque higher in the rpm range with a bigger top end charge and advancing a few degrees will lower both in the rpm's. Say someone accidentally installed the cam retarded a few degrees. Would not simply leaving the line at a higher rpm negate the effects of the cam being retarded and allow the car to leave the line with the maximun torque as if the cam was installed advanced a few degrees? Thanks Mike

Re: Cam timing question [Re: 70satelliteguy] #455351 08/31/09 09:43 AM 08/31/09 09:43 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	A camshaft properly ground for the engine, retarded more than a couple of degrees isn't just going to take all your HP and TQ numbers and raise them a few hundred RPM. The power is going to be down, sometimes significantly. Somebody may call BS on me but, that's my No matter, my answer is NO. IMHO opinion, where your camshaft is at, is something you should absolutely KNOW. As far as I'm concerned, "lining up the dots" or guessing at installed centerline is a huge mistake.

Re: Cam timing question [Re: 70satelliteguy] #455352 08/31/09 10:52 AM 08/31/09 10:52 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	The problem would be the converter... if it could go high enough to cover the torque loss .... my feelings are to advance the cam.... I usually advance them 4 - 6 degrees(depends) even over what the cam card says. Torque moves the object(car or what ever it is)

Re: Cam timing question [Re: MR_P_BODY] #455353 08/31/09 11:33 AM 08/31/09 11:33 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Quote: The problem would be the converter... if it could go high enough to cover the torque loss .... my feelings are to advance the cam.... I usually advance them 4 - 6 degrees(depends) even over what the cam card says. Torque moves the object(car or what ever it is) Advance for most cars especially heavy cars is my opinion a must. we have had dramatic results taking cams that were install a couple degrees retared of cam card suggested intake max lift and moving them a couple degrees ahead of cam card suggestions. Retared cams work well at 9500 rpm and slightly retared in dragsters with 6000 stalls is ok. Low end power is everything in heavy 2900 and up street strip cars. Your at the low end of rpm band most of the quarter (6000 and below) 6000 to 7000 is kind mid range to a cam so 7000 to 1000 would be high end where retarding a cam would help so how many of us are ther and for how long in a 1/4 mile run Last edited by Dodgem; 08/31/09 11:36 AM.

Re: Cam timing question [Re: 70satelliteguy] #455354 08/31/09 02:00 PM 08/31/09 02:00 PM
Joined: Aug 2003 Posts: 43,317 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,317 Bend,OR USA	Every cam I have installed retarted has not performed well I would check the cam centerline first and see where it is installed and then decide what to do. Let us know what you find and do and the results Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Cam timing question [Re: Cab_Burge] #455355 08/31/09 05:58 PM 08/31/09 05:58 PM
Joined: Oct 2007 Posts: 4,213 New York polyspheric master
polyspheric master Joined: Oct 2007 Posts: 4,213 New York	I agree - retarding the cam more than 2-4� is an interesting and potentially useful test (assuming your exhaust P/V clearance is safe), but if it produces good results, the cam was probably too small. Boffin Emeritus

Re: Cam timing question [Re: polyspheric] #455356 08/31/09 07:24 PM 08/31/09 07:24 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	I tried retarding a too small for combo cam from 106 to 110, the rpm did shift up but not the power, dropped some major torque, I would find a degree wheel and have at it on the proper specs

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