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Street and Performance A forum to discuss modifications related to street XJs and performance tweaking.

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  #1  
Old April 26th, 2004, 11:34
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Comp 68-232-4 Cam

Hi Guys;
I have been looking for which cam i need to order for my 99 4.6 stroker, i was going to go with the Crane #753905 204/216 degree cam, but have heard from people that it does not work well wuth the OBDII system, now this Comp 68-232-4 is the only one listed for fuel injected 4.0's, i was wondering if it would be too wild for my use. Any input will be appreciated.

thanks;
ravi
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  #2  
Old April 26th, 2004, 14:23
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Dr. Dyno Dr. Dyno is offline
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Re: Comp 68-232-4 Cam

The CompCams 68-232-4 is milder than the Crane 753905 and should work fine with the picky OBD II system. The CompCams unit has a wider lobe separation angle for a smoother idle and better vacuum, and has later valve opening and closing points. This allows the engine to run a slightly higher CR without pinging problems. The only downside is that peak HP output is less than with the Crane unit but peak torque output is about the same.
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  #3  
Old April 26th, 2004, 14:52
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Re: Comp 68-232-4 Cam

Quote:
Originally Posted by Dr. Dyno
The CompCams 68-232-4 is milder than the Crane 753905 and should work fine with the picky OBD II system. The CompCams unit has a wider lobe separation angle for a smoother idle and better vacuum, and has later valve opening and closing points. This allows the engine to run a slightly higher CR without pinging problems. The only downside is that peak HP output is less than with the Crane unit but peak torque output is about the same.
Cool thanks a lot, really apprecaite it as always.

ravi
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  #4  
Old April 26th, 2004, 15:22
karter74 karter74 is offline
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Re: Comp 68-232-4 Cam

How would the Crane Cams 753905 would work with a virtually stock 87 Cherokee? I already ordered it cause I thought it would be good, please tell me the same, lol.
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  #5  
Old April 26th, 2004, 16:06
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Re: Comp 68-232-4 Cam

Quote:
Originally Posted by karter74
How would the Crane Cams 753905 would work with a virtually stock 87 Cherokee? I already ordered it cause I thought it would be good, please tell me the same, lol.
You might want to port your existing head, using Dinos article and Bore your TB to 58mm, add a spacer, go with 19lb Ford injectors and shave 0.010 of your head to increase the compression,and add a Mopar performance head gasket. These should help out overall.

ravi
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  #6  
Old April 26th, 2004, 18:30
karter74 karter74 is offline
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Re: Comp 68-232-4 Cam

Well, I wanted to be able to use 87 pump gas still for now, so what do you think the limit is on compression to safely use this? I do plan on porting the head as the engine is currently out, but boring the throttle body and the TB spacer will come later. Do you think it will still run ok without them for now?
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  #7  
Old April 26th, 2004, 20:44
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Re: Comp 68-232-4 Cam

Quote:
Originally Posted by karter74
Well, I wanted to be able to use 87 pump gas still for now, so what do you think the limit is on compression to safely use this? I do plan on porting the head as the engine is currently out, but boring the throttle body and the TB spacer will come later. Do you think it will still run ok without them for now?
You should be fine, since the head is out make sure you do a good porting job as well as a 3 angle valve job.

ravi
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  #8  
Old April 26th, 2004, 22:41
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Re: Comp 68-232-4 Cam

Quote:
Originally Posted by karter74
Well, I wanted to be able to use 87 pump gas still for now, so what do you think the limit is on compression to safely use this? I do plan on porting the head as the engine is currently out, but boring the throttle body and the TB spacer will come later. Do you think it will still run ok without them for now?
The Crane 753905 cam will do fine and you'll still be able to run on pump gas even if you raise the CR to 9.1:1 by shaving 0.010" from the head and using a Mopar Performance head gasket.
Like Rav said, this is an opportunity to port your head and gain a few ponies. You can always add the bored TB and spacer later on to maximize the gains from the head porting job.
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  #9  
Old February 20th, 2006, 13:15
zak7711 zak7711 is offline
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Re: Comp 68-232-4 Cam

Dr. Dino,

You mentioned Comp Cam 68-231-4 on your info site but Comp Cam catalog mentions that it's not for fuel injected vehicles.. I tried calling Comp but the lines were hot and I was on hold waiting for my turn.. I needed to hear about the differences with the 68-232-4 which on the other hand is said to be designed for FI vehicles..

Ravi, I think you meant the Ford Racing 24# injectors

Thanks!
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  #10  
Old February 20th, 2006, 13:31
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Re: Comp 68-232-4 Cam

Congratulations, you just drug up a 2 year old thread..................
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  #11  
Old February 21st, 2006, 04:48
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Re: Comp 68-232-4 Cam

Quote:
Originally Posted by zak7711
Dr. Dino,

You mentioned Comp Cam 68-231-4 on your info site but Comp Cam catalog mentions that it's not for fuel injected vehicles.. I tried calling Comp but the lines were hot and I was on hold waiting for my turn.. I needed to hear about the differences with the 68-232-4 which on the other hand is said to be designed for FI vehicles..

Ravi, I think you meant the Ford Racing 24# injectors

Thanks!
The Compcams 68-231-4 works very well in an OBD II stroker so ignore the "not for fuel injected vehicles" bit. A friend of mine has this cam in his '97-based stroker and it behaves very similarly to my Crane 753905. He recently added a Vortech V2 supercharger and his TJ goes like a rocket after it hits 3000rpm.
The 68-232-4 has a slightly shorter exhaust duration, slightly less valve lift, and a wider lobe separation angle, making it an excellent blower cam. If you want to supercharge later on, this cam is the ticket though the aforementioned cams also work very well.
I'm sure Rav did mean Ford Racing 24lb injectors (for a stroker).
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  #12  
Old February 21st, 2006, 05:22
rsalemi rsalemi is offline
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Re: Comp 68-232-4 Cam

I have 35K miles on the Comp 235-4 (one step up from the 231) in my 89 stroker and it has 16" vacumn and runs fine.
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  #13  
Old April 20th, 2009, 11:05
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Re: Comp 68-232-4 Cam

To dig this back up, I'm considering going with the 235-4, and am wondering how long it has worked out for you long term?

I'm looking at about 9.5:1 with .040 quench on custom forged pistons, ported/polished HO head with 99+ intake and 24lb injectors and a borla header on a renix system, 4.7L.
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  #14  
Old April 21st, 2009, 04:48
rsalemi rsalemi is offline
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Re: Comp 68-232-4 Cam

67000 miles on cam and stroker, no issues, never had the valve cover off.
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  #15  
Old December 7th, 2010, 10:02
zak7711 zak7711 is offline
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Re: Comp 68-232-4 Cam

Digging up and dragging out this old thread again..

The 68-231-4 didn't run as I expected on my 99 XJ 4.6 with CR 10:1. The idle is a bit rough and the vacuum reading at idle (fluctuating at around 850 rpm) is just under 10 inHG where it should be at 16 inHG. The spark advance is 22 degrees, engine load between 4.7-5% and TPS is 24.3% as checked using a Equus Innova 3130 OBDII scanner.

I checked the tube connectors for possible vacuum leaks using a carb cleaner spray can, nothing found. I wonder if the brand new intake manifold gasket's gone bad or is it just the cam! I can't spray anything on that cuz it's close to the exhaust header.

Sometimes it misses so badly while I'm driving, makes me feel I hit something on the road. I'll change the TPS, ECT sender and vacuum connectors just to verify. Wait! My ECM was stolen by the bastards in the garage so I'm using a 5616492 Cal-Emissions ECM, but that won't cause all that.
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