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post #1 of 12 (permalink) Old 08-20-2012, 03:20 PM Thread Starter
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Cam specs 3.2/3.5/4.0

Okay, so I've done a ton of searching on the question of cam swaps between the three. Does anyone actually have specs for the cams out of each of these motors?

I have a '98 3.2 I want to add more to before I swap it in. From what I understand, I can use newer 3.5 camshafts and swap the cam sprockets from my 3.2 and everything should work fine as far as the keyed ends go. But the 4.0 camshafts need ground down to fit the d-shaped key way of the 3.2/3.5 style sprockets.

Now to make things more clear on which one will be preferred to put in, I'd like to know more specs on the duration/separation of these camshafts. Only thing I could loosely gather so far is the 3.5 has the same lift and slightly longer duration over the 3.2 camshaft. The 4.0 is kind of mixed to me on what it may have.

Anyone with this swap care to chime in on difference felt?
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post #2 of 12 (permalink) Old 08-20-2012, 08:57 PM
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3.2 and 3.5 cam specs. are in the FSM, also here: https://www.dodgeintrepid.net/showthr...65#post1679365
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post #3 of 12 (permalink) Old 08-21-2012, 12:00 AM Thread Starter
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Awesome. How did I miss that thread?!? Thanks. Happen to have a link to specs on the 4.0 cam?

That would definitely be worth it if I found a set of used 3.5 cams cheap enough, and in good shape. But if the 4.0 cams aren't too big or similar, they are pretty cheap new. I have access to a great small lathe and mill.
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post #4 of 12 (permalink) Old 08-21-2012, 12:25 AM
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putting 3.5 cams in a 3.2 will raise your torque curve, cutting your bottom end.
in other words, it'll have to be more wound out to make power. could make it more of a slug without lower gearing.
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post #5 of 12 (permalink) Old 08-21-2012, 01:04 AM Thread Starter
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Quote:
Originally Posted by hrmwrm View Post
putting 3.5 cams in a 3.2 will raise your torque curve, cutting your bottom end.
in other words, it'll have to be more wound out to make power. could make it more of a slug without lower gearing.
Already using a 2.7 transmission.
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post #6 of 12 (permalink) Old 08-21-2012, 02:14 AM
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well, could be worth the experiment then.
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post #7 of 12 (permalink) Old 08-21-2012, 06:01 AM
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Intake spacer would also buy back some low end.
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post #8 of 12 (permalink) Old 08-21-2012, 06:16 AM
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Quote:
Originally Posted by Dirdy View Post
Awesome. How did I miss that thread?!? Thanks. Happen to have a link to specs on the 4.0 cam?...
Yes and no. See post no. 381: https://www.dodgeintrepid.net/showthr...cs#post1952747

Apparently Bob's photo links are no good anymore. Maybe PM him.

EDIT:
With a little Binging, found this (http://hjeepxj0.tripod.com/id15.html
- assuming it's the right 4.0 engine):

Duration: 253.3/259.0 degrees
Cam lobe lift: 0.265"
Rocker arm ratio: 1.6
Valve lift: 0.424"
Lobe separation angle: 107.3 degrees
Intake centerline angle: 114.3 degrees
Valve overlap: 41.6 degrees
IVO: 12.4 degrees BTDC
IVC: 60.9 degrees ABDC
EVO: 49.8 degrees BBDC
EVC: 29.2 degrees ATDC


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs

Last edited by peva; 08-21-2012 at 06:26 AM.
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post #9 of 12 (permalink) Old 08-21-2012, 09:43 AM Thread Starter
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Quote:
Originally Posted by peva View Post
EDIT:
With a little Binging, found this (http://hjeepxj0.tripod.com/id15.html
- assuming it's the right 4.0 engine):

Duration: 253.3/259.0 degrees
Cam lobe lift: 0.265"
Rocker arm ratio: 1.6
Valve lift: 0.424"
Lobe separation angle: 107.3 degrees
Intake centerline angle: 114.3 degrees
Valve overlap: 41.6 degrees
IVO: 12.4 degrees BTDC
IVC: 60.9 degrees ABDC
EVO: 49.8 degrees BBDC
EVC: 29.2 degrees ATDC
Actually, that's an inline engine. Jeep 4.0 is a straight 6 cylinder. Tough engine, but far away from the 4.0 were looking for
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post #10 of 12 (permalink) Old 08-21-2012, 03:08 PM
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I wondered. Sorry. I noticed that they mentioned stroker in that article, so I figured maybe . . .
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post #11 of 12 (permalink) Old 08-21-2012, 04:11 PM Thread Starter
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I wouldnt have known if I haven't worked on them before(one in the driveway right now). Engine work is no mystery to me.

I think the 3.5 cam is a good choice. It's not to much different so the computer can handle it fine. But it is enough to make a big difference. It's like a mild street cam for a small block v8.

I have a pick'n'pull type of yard not far from me with tons of lh cars. I'm confident I can find a good set there. Only $9.99 each. I'm hoping to find an older 3.5 to yank exhaust manifolds off of.

I'm still looking for the 4.0 cam specs
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post #12 of 12 (permalink) Old 08-21-2012, 06:17 PM
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...
Quote:
Originally Posted by peva View Post
...Apparently Bob's photo links are no good anymore. Maybe PM him...
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