Dzimm Posted October 13, 2020 Share Posted October 13, 2020 The ongoing discussion in the 800+ HP post over on the Pub has got me wondering about actually achievable power increases we could attain 'relatively' easily. We have all heard and talked about bored TB, injectors, horseshoe intake, ect, More specifically I'm curious about camshafts available for the 4.0. Does anyone know of camshafts that increase power without causing other negative affects for this motor? What auxiliary upgrades may be required to swap in an agressive cam? I've never really dig into it to get the info but in sure some of you have read up on this. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 13, 2020 Share Posted October 13, 2020 I’ve run a few different cams. The latest cam I’m running is a 505 performance cam (not a fan of the customer service but the cam is nice). Keeps plenty of torque down low but keeps a surprisingly flat response and doesn’t die off at higher rpm. Granted, I built up my 4.0 quite a bit. Also ran the comp 235 and 232 along with the Mopar purple cam. Link to comment Share on other sites More sharing options...
Dzimm Posted October 13, 2020 Author Share Posted October 13, 2020 How did the other cams work for you? I'm personally interested in finding something that will give me quick response and acceleration over anything else. Link to comment Share on other sites More sharing options...
derf Posted October 13, 2020 Share Posted October 13, 2020 I'm interested too. I may be looking at a rebuild in my XJ soon and that would be a good time for a cam or other things like that. Link to comment Share on other sites More sharing options...
89 MJ Posted October 13, 2020 Share Posted October 13, 2020 Ooooooooohhhhhhhhhhhhh. I am definitely going to be following this. I would love a little bit more from my 4.0. Link to comment Share on other sites More sharing options...
75sv1 Posted October 13, 2020 Share Posted October 13, 2020 http://www.jeep4.0performance.4mg.com/ I sort of followed this website. I have messed with a few of the upgrades. I have not changed out the cam. I'd have to check what cam I bought for my stroker. I think a Comp Cam 268 ??? from Russ Pottenger. I was not after HP, but a street able engine and MPG. My compression will be roughly 9.0:1. Some of this would be matching upgrades. I did put on a 2.5 exhaust, Thorley Ceramic Header, and the horseshoe intake. Also, Ford Injector. There was probably some power increase. When I bored the stock TB to 60mm, I did much better on some mountain inclines. When I went to a BBK 62MM TB, it felt rougher. Not knocking the BBK TB. It could have been other issues. I installed some 12 hole injectors. Initially, it seemed like a big improvement. Then it sort of 'lost tune'. I will add that regearing helped. I went from 31's and 3.55 gearing to 31's and 4.10 gearing. Big help. Sometime in that, I did a HnT. That helped a driveline vibe, and also, it seemed to jam up or lose power around 40 mph. Still, a lot to learn for me. Also, some other mods to test. Link to comment Share on other sites More sharing options...
omega_rugal Posted October 13, 2020 Share Posted October 13, 2020 bored throtle body and removing the exhaust restriction are easy tweaks. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 13, 2020 Share Posted October 13, 2020 The Mopar cam felt a lot like stock HO cam. About the same curve with maybe a touch more. Both comp cams added a good amount of torque under the curve between 1500-2000 rpm but fell flat on their faces at about 4500rpm. Haven’t tried Lunati, Crane or Isky. You could also do a custom grind with most of those manufacturers. Here is how I built my latest 4.0: 250k 96 block (first year for NVH enhancements) bored .060 decked for zero clearance (pistons actually .003 out of the hole. rotating assembly balanced KB hypereutectic pistons arp rod, main and head bolts Cometic .040 MLS head gasket Edelbrock aluminum head 63mm throttle body (63mm is the actual opening size on the HO and 99+ intakes 505 stage 1.5 cam adjustable roller rocker Molly pushrods Hylift-Johnson type S lifters melling high volume oil pump 505 Teflon cam bearings king main and rod bearings 99 intake ford purple 24lb 6 hole injectors JBA exhaust with TJ downpipe (wraps in front of the oil pan) Compression is just about 10:1 but with quench at .037 I get no issues running 87 though I mostly run 91. I don’t have access to a dyno here but this rig definitely outperforms my last stroker build in my YJ. I will say though that the aw4 really is a power leech. My next project if time and funds allow us to get the ecu socketed and tune it. I ran a Holley stand alone efi on the YJ but haven’t gotten around to doing that in the mj. And one last note: after having dealt extensively with Clifford, Hesco and 505 Performance, I really don’t recommend any of them. Some of their products are decent but between misrepresenting products, overpricing off the shelf components and terrible customer service I’ve come to group them all into my “don’t contact them unless there is no one else” category. Russ Pottenger does amazing work however and his pricing and skills can’t be beat. Clegg actually gave me really good customer service as did Hylift-Johnson and of course Summit Racing as always. Comp cams would also hardly ever answer the phone or a tech question but I just bought through summit instead once I knew what I needed. Edelbrock was very helpful and the guys @ efi systems pro (all things Holley efi) were also super good to work with. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 13, 2020 Share Posted October 13, 2020 And here are all the known Jeep 4.0 cam specs: http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm Dino Savala keeps that site uodated along with the stroker site mentioned above. And for any 91+ 4.0 tuning contact chris@christuned.com His tuning of obd 1 is quite amazing and also tunes obd 2 with HP tuners. Link to comment Share on other sites More sharing options...
MiNi Beast Posted October 14, 2020 Share Posted October 14, 2020 man thats alot of math and details. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 14, 2020 Share Posted October 14, 2020 16 minutes ago, MiNi Beast said: man thats alot of math and details. This was probably my 10th 4.0 based build. I just started memorizing the specs after a while Link to comment Share on other sites More sharing options...
omega_rugal Posted October 14, 2020 Share Posted October 14, 2020 According to that chart, Renix and early mopar are identical, is that correct? how they got rid of the EGR? Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 14, 2020 Share Posted October 14, 2020 1 hour ago, omega_rugal said: According to that chart, Renix and early mopar are identical, is that correct? how they got rid of the EGR? Almost identical. Same lift but the intake lobe has a different angle. I’ve never used a stock renix cam but I assume it would give just a bit more vacuum than the HO model. Link to comment Share on other sites More sharing options...
Swampy Posted October 14, 2020 Share Posted October 14, 2020 Newcomer racing just built a 4.0l that broke some kind of record. It was running a turbo. I can't seem to find the video right now Edit: Found the video Link to comment Share on other sites More sharing options...
omega_rugal Posted October 14, 2020 Share Posted October 14, 2020 a new record, good for dyno pulls only Link to comment Share on other sites More sharing options...
Swampy Posted October 14, 2020 Share Posted October 14, 2020 True but still showcases the 4.0l ability Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 14, 2020 Share Posted October 14, 2020 A cross flow head would probably be one of the best bolt on NA mods for this I6 but would be quite a challenging design. At some point though it’s probably worth just swapping in a different engine. I’ve considered that for my far distant future build. I think also if electric superchargers really take off that could be a neat power adder. Supposedly Garrett was coming out with one. Link to comment Share on other sites More sharing options...
75sv1 Posted October 14, 2020 Share Posted October 14, 2020 Russ carries nitride Comp Cams. I believe he gets cams ground to his specs. Yes, good to deal with. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 14, 2020 Share Posted October 14, 2020 50 minutes ago, 75sv1 said: Russ carries nitride Comp Cams. I believe he gets cams ground to his specs. Yes, good to deal with. Yeah he can get you the best setup for sure Link to comment Share on other sites More sharing options...
75sv1 Posted October 14, 2020 Share Posted October 14, 2020 1 hour ago, ghetdjc320 said: Yeah he can get you the best setup for sure Also, he will get you a setup to meet your needs. I didn't want the ultimate 4.6 stroker.. I wanted a street motor, to run on 87 octane. Pistons, cam, head CC, to achieve this. Link to comment Share on other sites More sharing options...
omega_rugal Posted October 14, 2020 Share Posted October 14, 2020 7 hours ago, ghetdjc320 said: A cross flow head would probably be one of the best bolt on NA mods for this I6 but would be quite a challenging design. At some point though it’s probably worth just swapping in a different engine. I’ve considered that for my far distant future build. I think also if electric superchargers really take off that could be a neat power adder. Supposedly Garrett was coming out with one. a crossflow head, with 2 spark plugs... twice the pleasure such head would need to be OHC which will need mjor modifications to the engine... or to run a large chain in front of the engine Link to comment Share on other sites More sharing options...
omega_rugal Posted October 14, 2020 Share Posted October 14, 2020 wait, if we remove the timing cover it may run all the way up... mmm Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 14, 2020 Share Posted October 14, 2020 6 hours ago, omega_rugal said: wait, if we remove the timing cover it may run all the way up... mmm You’d have to redesign the water outlets, run a coil pack ignition and get a new cam sensor setup. It could definitely be done but by someone who owns a CNC shop with a huge budget and a love of the 4.0. Essentially they would be building a BMW engine and there’s nothing wrong with that Link to comment Share on other sites More sharing options...
75sv1 Posted October 15, 2020 Share Posted October 15, 2020 Didn't GM have a cross flow head on their I-5, a few years back. I see this as more of finding someone to cast it. Link to comment Share on other sites More sharing options...
omega_rugal Posted October 15, 2020 Share Posted October 15, 2020 have anyone played with the exhaust? long pipes, short pipes, more diameter, less diameter, after all it affects scavenging and power band Link to comment Share on other sites More sharing options...
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