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Unread 02-14-2006, 11:16 PM   #1
MikeP928
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Would you call it a Porscheep or a CJ7S4?

I know some folks tend to swap in engines they already have around. That got me to thinking about a little goodie I have in the shop.

I am considering swapping in a Porsche 928 5.0 ltr V8. It has aluminum heads and block with cast in ceramic sleeves, DOHC, 32 valves, hemi head chambers, and dual distributors.

It is much lighter that a cast iron V8 obviously, and normally runs a fixed enclosed driveshaft to a rear transaxle. If I run an TH350 or 400, It should only need the bellhousing adapter and short driveshaft adapter (custom made, $$$$$). I can fab the mounts and modified crossmember.

I have all the electronics and fuel system, so I can fab a new gas tank and use the intank fuel pump.

At 320 hp and 275 ft lbs of torque, it has all the power I need to run what we have in north Florida (sand and mud). It has a very flat torque curve starting at about 2200 rpm. It has to have to pull a 3600 lb car from 0-60 in 6 seconds with 2.20 gearing.

Has anyone seen anything similar to this?

A nice side benefit will be a set of Recaro buckets to replace the oem's.

So if you see a plain white CJ7 running around with an antique tag and a really sweet sound. Look for the S4 label on the rear corner.

MikeP

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Unread 02-15-2006, 03:36 AM   #2
John Strenk
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Hmmm... "The THING" on steroids.

Maybe no one remembers VW's "The Thing".

I guess you can always tell people it was a captured CJ in WWII converted to a German power train for evaluation by the Axis powers.
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Unread 02-15-2006, 06:21 AM   #3
fuzz401
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I rember the thing
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1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
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Unread 02-15-2006, 06:37 AM   #4
webdr
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what are the waves like at mexico beach now? I heard they have a pretty good shore break for skimboarding...looking to take a trip to florida soon.
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Unread 02-15-2006, 07:53 AM   #5
No_Bs
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One of my buddies has a Thing, all original and in perfect shape.
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Unread 02-15-2006, 08:17 AM   #6
CJ51973
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0 to 60 mph in 6 sec in a CJ ought to be interesting. Think of the fun you'll have with the ricers
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Unread 02-15-2006, 08:41 AM   #7
MikeP928
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Quote:
Originally Posted by webdr
what are the waves like at mexico beach now? I heard they have a pretty good shore break for skimboarding...looking to take a trip to florida soon.
Normally there are just enough waves and a slightly tapered beach to make this area great for skimboarding, which I got into about 1966. Yeah, I'm an old fart.

The storms of the last month have kept the break to far up on the beach. It should be settled back down in another month or so.

I will be putting up a beach cam, actually a canal cam this weekend for people that like to monitor the jetty and surf conditions. I am donating about $5K worth of wireless network and high end network camera equipment to the tourist development council so people can monitor the condition of the jetty (can they get their boat out through the cut?) I will send you a web site as soon as we get all the bugs out.

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Unread 02-15-2006, 09:08 AM   #8
MikeP928
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Quote:
Originally Posted by CJ51973
0 to 60 mph in 6 sec in a CJ ought to be interesting. Think of the fun you'll have with the ricers
The Mustangs and Camaro guys learned pretty quick, the rice rockets never give up. The donor is one of a pair of 928s I have. If it could do 6 seconds with 3600 lbs, it should be in the low 5s with a little over half the weight and 4.10 gearing. I should be able to hurt somebody's feelings with it.

Another side benefit should be better gas mileage. Both 928s gave me about 21 mpg on the hiway.

MikeP
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Unread 02-15-2006, 09:27 AM   #9
fuzz401
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my jeep does the 1/8 mile in 8.5 seconds at 82 mph with a 401
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1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
http://img2.photobucket.com/albums/v...slideshow=true
http://photobucket.com/albums/v31/fu...slideshow=true
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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Unread 02-15-2006, 04:52 PM   #10
JERSEYJOE
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Mike I just sold my 1990 928 GT. It was a sweet car. Since the trans is in the rear ans part of the transaxle, are you going to run a similar setup?
The S4 was the automatic version and used a Mercedes Trans?
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Unread 02-15-2006, 05:19 PM   #11
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I would be concerned that the engine would not tolerate the heat build up that offroading can put an engine through. I never had a 928, but I did have a 944 and the top end was ruined by a mere air bubble in the cooling system causing it to overheat....

That is a pretty touchy motor for something that is most likely going to be over-revved, then lugged, splashed with cold water while it's hot, and then put away without much pampering (typical offroading conditions )
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Unread 02-15-2006, 08:04 PM   #12
MikeP928
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Quote:
Originally Posted by Jersey Joe
Mike I just sold my 1990 928 GT. It was a sweet car. Since the trans is in the rear ans part of the transaxle, are you going to run a similar setup?
The S4 was the automatic version and used a Mercedes Trans?
Along with the donor 86.5 S3, I have a 1990 S4 w/ auto. I have a sample of the solid steel driveshaft end for spline measurement. I rung one into playing with a Maserati in Atlanta one time. $1700 to get a used one installed so I could get back to Florida.

I want to mate the engine to a TH350 or 400 in a normal configuration. The only way to run close to the original configuration would be to adapt the running gear out of a Carrera C4, and I can't even imagine what that would cost.

I am picking up a full size Cherokee to skarf the running gear. This will give me a TH400 to take measurements from.

I had planned to do a ground up resto on the S3, but Florida is putting in cameras and radar on the major roads, along with tripling the number of troopers. The days of 170 mph blasts are becoming a thing of the past. I can't afford any more speeding tickets. So I am moving back offroad for my kicks. I am going to sell the '90 this spring, it has 83K miles and is in fantastic condition. What did you get for your GT?

MikeP
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Unread 02-15-2006, 08:13 PM   #13
MikeP928
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Quote:
Originally Posted by CJ5_Fan
I would be concerned that the engine would not tolerate the heat build up that offroading can put an engine through. I never had a 928, but I did have a 944 and the top end was ruined by a mere air bubble in the cooling system causing it to overheat....

That is a pretty touchy motor for something that is most likely going to be over-revved, then lugged, splashed with cold water while it's hot, and then put away without much pampering (typical offroading conditions )

I am not too concerned about the heat. I have logged over 90K miles in 928s in Florida. I use them to call on customers and sometimes wind up sitting in an asphault parking lot in August and idling for 30-45 minutes. And consistantly getting caught in heavy traffic. There is a lot more ventilation room in a CJ than there is under the hood of a 928. I agree the cooling system is unforgiving, but I have owned at least one since 1997, usually more than one, and am used to burping the cooling system.

And I just want to keep the sweetest V8 rumble I have ever heard around when I sell my wife's.

MikeP
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Unread 02-15-2006, 10:30 PM   #14
Dj Brady
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The thing to keep in mind is your 928 engine only pushes 108lbs of torque.

Jeep engines are designed to create quite a bit more torque for slow grunt.

It sounds like a fun conversion though, best of luck
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Unread 02-16-2006, 02:38 AM   #15
MikeP928
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Quote:
Originally Posted by Dj Brady
The thing to keep in mind is your 928 engine only pushes 108lbs of torque.

Jeep engines are designed to create quite a bit more torque for slow grunt.

It sounds like a fun conversion though, best of luck
I don't know where you got your number from, but it is pushing 200+ at 2500 rpm and 275 at 5200 rpm.

MikeP
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