|
|
motor?
Jan 19, 2009 8:29:15 GMT -5
Post by Codi12c on Jan 19, 2009 8:29:15 GMT -5
say u have a stock 305 roller motor with fuel injected heads and had to take the roller cam and lifters out and stuck a decently large cam and stock lifters in would u lose or gain power?
|
|
|
|
motor?
Jan 19, 2009 11:18:49 GMT -5
Post by Challenger 75R on Jan 19, 2009 11:18:49 GMT -5
Thats a tricky Q?. It really comes down to how the cam is designed. For the most part Roller cams make more power by loosing drag on the cam surface and by holding the valve open longer. The Cam you are swapping to will hafta be bfairly bigger to make up the difference. Another thing you need to check is total lift your valve springs can handle so you don't run the risk of bottoming out the spring. Also you will need to check clearince on the valve to piston. We like to keep it around .090 for heat expansion and to make sure we don't haft to worrie about the valve hitting the piston. Talk to who ever dose your machine work and they should be able to help you get a cam for your app that will work. On my dodge street truck we just called Comp and got the biggest cam (I stuck with a roller) we could that would not require changing valve springs.
Hope that helped
|
|
|
|
motor?
Jan 19, 2009 15:05:39 GMT -5
Post by Codi12c on Jan 19, 2009 15:05:39 GMT -5
thanks chris it really did . so far alls good but evertime i say that sumthin happens so guess ill go with the flow. thnks again.
|
|
|
|
motor?
Jan 19, 2009 18:21:42 GMT -5
Post by Challenger 75R on Jan 19, 2009 18:21:42 GMT -5
Yeah my truck's (95 dodge ram 1500) motor turned out to be a beast thanks to the Machine shop that did the work on it. Got 400 out of it naturaly and put a 100 shot on top of that! Switched it from stock dodge fuel injection to demon carburation, changed cam, bumped up the compression, cleaned up the stock heads, added MSD timeing, and balenced it. The dang thing sounds like an arca car and runs like a scaled a$$ed ape!! LMAO! Man nobody can build power like a Mopar but they cost a ton to build!! LOL
|
|
|
|
motor?
Jan 21, 2009 13:37:02 GMT -5
Post by alex on Jan 21, 2009 13:37:02 GMT -5
id run my lil' 2000 swb chevy against that dodge
|
|
|
|
motor?
Jan 21, 2009 17:29:44 GMT -5
Post by racinnut15xm on Jan 21, 2009 17:29:44 GMT -5
i cut the exhaust off a 2002 dodge and started it and it was louder than any purestock out there. they have to be pushin more than the sbc purestocks
|
|
|
|
motor?
Jan 21, 2009 18:30:25 GMT -5
Post by scamp on Jan 21, 2009 18:30:25 GMT -5
id run my lil' 2000 swb chevy against that dodge cheater |
|
modracer0
Crew Chief
dont know do you
Posts: 121
|
motor?
Jan 21, 2009 19:40:31 GMT -5
Post by modracer0 on Jan 21, 2009 19:40:31 GMT -5
the heads i had didnt like alot of lift but loved some duration how ever u spell it
|
|
|
|
motor?
Jan 22, 2009 10:56:42 GMT -5
Post by alex on Jan 22, 2009 10:56:42 GMT -5
id run my lil' 2000 swb chevy against that dodge cheater Sssssh slade, you know my truck is bone stock.  |
|
|
|
motor?
Jan 23, 2009 11:08:40 GMT -5
Post by Codi12c on Jan 23, 2009 11:08:40 GMT -5
welllllllllll now its knokin tin the top end and im not that smart when it comes 2 lifters but they seem like they set sdown 2 far its knockin in the top but it quit then starts agan then tries 2 carap out and die. any ideas on what 2 check?
|
|
|
|
motor?
Jan 23, 2009 11:43:20 GMT -5
Post by LEADSLED on Jan 23, 2009 11:43:20 GMT -5
hmmm the only way a lifter can sit to low is if you have a cam lobe down! that would cause you to tighten the rocker arm down further than the others to get your valve lash also! look are your rocker arm studs and see if the ones that are knockin are showing more threads than the others that might tell the story!
|
|
|
|
motor?
Jan 23, 2009 11:47:23 GMT -5
Post by Codi12c on Jan 23, 2009 11:47:23 GMT -5
ok thanks t this point any thang helps. o jst curious why cnt u use a hydraulic cam with roller lifters?
|
|
|
|
motor?
Jan 23, 2009 11:54:50 GMT -5
Post by LEADSLED on Jan 23, 2009 11:54:50 GMT -5
THE newer vehicles do use roller lifters with hydraulic roller lifters! the main reason a roller is used is for less friction from the roller bearings on the bottom of the lifter which then means the cam manufactures can use a more aggressive cam design with higher lifts and steeper lobes! I guess you could use one don't know if the cam would stand up to the lifter or not! you would have to make sure you used a aftermarket lifter unless your block is designed for the newer style roller lifters to keep them from turning on you! which depending on the class you are running is illegal anyways unless you are running llm or superstock!
|
|
|
|
motor?
Jan 31, 2009 18:48:21 GMT -5
Post by deanbitner on Jan 31, 2009 18:48:21 GMT -5
There's another HUGE reason many auto manufacturers are going to roller setups. EPA ( Environmental Protection Agency ) standards mandated a much reduced Zinc level in motor oils. The plan is to eliminate Zinc completely from production motor oils.
Since Zinc is used principally as a lubricant to prevent wiping off the cam lobes, and since it is greatly reduced or eliminated from oil now ... many non-roller cams are suffering premature failure. Maybe some input from Fausten or ORA's would be good on this one ?
Here's a link to a HotRod Magazine article on the subject. Chalk one up for the bureaucrats and the tree huggers !
Dean
|
|
