lower jeep Posted August 16, 2007 Share Posted August 16, 2007 does any one know where i can get a cam for my 4.0 Link to comment Share on other sites More sharing options...
87manche Posted August 16, 2007 Share Posted August 16, 2007 hesco and crane both make cams for the 4.0. check summit's page. Link to comment Share on other sites More sharing options...
LEAD_NOT_FOLLOW Posted August 16, 2007 Share Posted August 16, 2007 I'm very happy with my Comp Cam in my 4.6L stroker. Link to comment Share on other sites More sharing options...
lower jeep Posted August 16, 2007 Author Share Posted August 16, 2007 there are a few types of cams what duration should i get it i am runnig a stock engine, with a cold air intake i want something that is still driveable but has a lot of power. Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted August 16, 2007 Share Posted August 16, 2007 As a general rule of thumb...You MUST increase the ability to get air/fuel in and OUT to get any real benefit of a cam swap. You MUST be able to flow better to get the full benefit of the new cam. Think of it this way..... A 100FT of 1/2" hose with a pump smack in the middle. The pump is rated to flow max at top efficiency with X hp in a 1/2" hose. Put in a new pump at 25% greater HP with the same hose...what do you get...NO real increase as it already was operating at top efficiency. BUT increase the dia of the hose 25% up to 5/8" now you will be getting TOP performance form the new pump, (cam).. get it? CW Link to comment Share on other sites More sharing options...
DirtyComanche Posted August 16, 2007 Share Posted August 16, 2007 You can fudge on it though. A stock 4-oh header isn't too bad in the flow department. I think a guy can use the HO ones which are a little better, just they lack EGR. IMHO, you'd see more performance in the exhaust side by port matching the head than changing the header. The rest of the exhaust might be worth 'improving' though. However, I know little about the cam choices for a 4.0. Link to comment Share on other sites More sharing options...
Eagle Posted August 17, 2007 Share Posted August 17, 2007 there are a few types of cams what duration should i get it i am runnig a stock engine, with a cold air intakei want something that is still driveable but has a lot of power. Define "power" as you mean it. Are you looking for low-end torque (pulling power), which would indicate one type of cam ... or are you looking for high RPM horsepower, which would dictate a very different cam. Like most things in life, there ain't no "one size fits all." Link to comment Share on other sites More sharing options...
lower jeep Posted August 18, 2007 Author Share Posted August 18, 2007 ok so i want some thing that would give me the best power thru the entire rpm range but mostly in the mid range, but i am still confused about it some but that explained it better than any thing else Link to comment Share on other sites More sharing options...
Oizarod115 Posted August 18, 2007 Share Posted August 18, 2007 http://auto.howstuffworks.com/camshaft2.htm you basically want more overlap of the exhaust/intake and more duration at higher rpms Link to comment Share on other sites More sharing options...
lower jeep Posted August 19, 2007 Author Share Posted August 19, 2007 so here are the cams i am looking at getting any advise would be helpfull on the desision Product Line: Crane PowerMax Camshafts Part Type: Camshafts Cam Style: Mechanical flat tappet Basic Operating RPM Range: 2,500-6,000 Intake Duration at 050 inch Lift: 228 Exhaust Duration at 050 inch Lift: 238 Duration at 050 inch Lift: 228 int./238 exh. Advertised Intake Duration: 264 Advertised Exhaust Duration: 274 Advertised Duration: 264 int./274 exh. Intake Valve Lift with Factory Rocker Arm Ratio: 0.533 in. Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.555 in. Valve Lift with Factory Rocker Arm Ratio: 0.533 int./0.555 exh. lift Lobe Separation (degrees): 112 Intake Valve Lash: 0.028 in. Exhaust Valve Lash: 0.030 in. Product Line: Crane Truck Power Camshafts Part Type: Camshafts Cam Style: Hydraulic flat tappet Basic Operating RPM Range: 1,500-4,500 Intake Duration at 050 inch Lift: 204 Exhaust Duration at 050 inch Lift: 216 Duration at 050 inch Lift: 204 int./216 exh. Advertised Intake Duration: 260 Advertised Exhaust Duration: 272 Advertised Duration: 260 int./272 exh. Intake Valve Lift with Factory Rocker Arm Ratio: 0.456 in. Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.484 in. Valve Lift with Factory Rocker Arm Ratio: 0.456 int./0.484 exh. lift Lobe Separation (degrees): 112 Intake Valve Lash: 0.000 in. Exhaust Valve Lash: 0.000 in. Computer Controlled Compatible: No Grind Number: H-260-2 Link to comment Share on other sites More sharing options...
FxRacing282 Posted August 22, 2007 Share Posted August 22, 2007 hmm both of those cams look to have low rise but I'm not to familiar with jeeps. id say the top one. or if you can get one thats good to like maybe idle to 3k you don't loose power its just that the cam is designed to operate better at those RPMs and youll make enough torque to get going pretty good. Link to comment Share on other sites More sharing options...
pingpong Posted August 22, 2007 Share Posted August 22, 2007 YOu also have to look at how you drive your rig, and where you need the power. MOst 4.0 live under 2000rpm, or when they are getting abused see 3000 to 3500rpm. I know when I wheel it is rare for it to see the rev limiter Link to comment Share on other sites More sharing options...
lower jeep Posted August 22, 2007 Author Share Posted August 22, 2007 i am not looking for a motor that is NOT going to see any wheeling because its going in my lowered mj i want to rebuild this new engine that i got for cheap the guy said it ran but hes puting in a 4.3 out of a chevy, i want to rebuild it and make more power for the motor and make it sound beefy :D Link to comment Share on other sites More sharing options...
pingpong Posted August 22, 2007 Share Posted August 22, 2007 To rebuild for power.. I suggest you start with the Jeep engines book 3rd edition. It is chuck full of ideas on how to squeeze the most power out of them. ON page 176 it has jeep part numbers and lift and duration numbers for the cams, it also has a few tips on buiding the 4.0 to be a reving motor. Link to comment Share on other sites More sharing options...
FxRacing282 Posted August 22, 2007 Share Posted August 22, 2007 well if you want it to sound beefy and have some balls then i suggest hi-top or dome pistons (.30 overbore), stiff valve springs hydrollics rollers, high performance cam, oversize injectors and a nice header pipe and a high flow cat with a cherrybomb on the end. and youll have a nice looking, sounding and one fast Comanche! Link to comment Share on other sites More sharing options...
mjtjnj Posted August 23, 2007 Share Posted August 23, 2007 not to start a whole new topic, but while we're on it, are there any aftermarket 2.5 cams? Anyone used em? Link to comment Share on other sites More sharing options...
lower jeep Posted August 24, 2007 Author Share Posted August 24, 2007 To rebuild for power.. I suggest you start with the Jeep engines book 3rd edition. It is chuck full of ideas on how to squeeze the most power out of them. ON page 176 it has jeep part numbers and lift and duration numbers for the cams, it also has a few tips on buiding the 4.0 to be a reving motor. is this the book that you guys are talking about? http://www.amazon.com/Jeep-Performance-Handbook-Motorbooks-Workshop/dp/076030470X/ref=pd_bxgy_b_text_b/103-5304937-5054241?ie=UTF8&qid=1187974611&sr=8-12 Link to comment Share on other sites More sharing options...
pingpong Posted August 27, 2007 Share Posted August 27, 2007 No the one I was talking about is the Mopar Performance Parts Jeep Engines 3rd Edition Part Number: P5007161 Link to comment Share on other sites More sharing options...
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