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Unread 05-11-2009, 04:54 PM   #1
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1978 CJ7 
Join Date: May 2009
Location: wv
Posts: 2
Power Problems...

ok let me just get you the history of whats going on....im working on a 78 cj7 it had a 360 with the t-150 3 speed and dana 20 transfer, 3.73 gears with 35's... well the 360 broke a rod and ruined the block...so I built a sbc 350 to replace it, nothing fancy a basic stock rebuild went with a summit cam 214/224 duration @ .050 and lift of .442/.465...bolted that to a th350 and an np205 transfer. Well got everything in engine has a real good tune on it...but it is a DOG....just no power, from a dead stop im lucky if it will even chirp the tires..i mean the other combo would almost hang itself up on wet roads...from a roll. I've done everything i know how to do, its driving me crazy...could it be that the transmission ratio's are causeing this?...

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Unread 05-11-2009, 05:56 PM   #2
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2003 TJ Wrangler 
Join Date: Nov 2005
Location: Palm Harbor, Fl.
Posts: 557
Sounds like carb jetting, and/or ignition timing/curve; need more info.
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Unread 05-11-2009, 06:10 PM   #3
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1978 CJ7 
Join Date: May 2009
Location: wv
Posts: 2
im running a edelbrock 650 its nice and snappy...dont seem to rich or lean. As far as the timeing goes im running 12 degrees base then i have it set to get total timeing by 3000 and the total timing is set at 35 degrees
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Unread 05-11-2009, 11:24 PM   #4
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2007 JK Wrangler 
Join Date: Jun 2007
Location: Colorado
Posts: 458
Kind of reminds me of my first car, you are bringing back fond memories...

73 Nova
350 w/corvette heads and huge cam! (ERSON .530 lift and 318 duration, hyd.)
10.5:1 compression
650 DP with Performer intake

I stuck a 3 speed into it to get the RPMs up, it would smoke all 3 gears. I decided to go back automatic to stay consistent at the track, but my "seat of the pants" power dropped off considerably, but I figured out my stall speed wasn't jiving with my cam/heads/compression combo. I used a 3200 rpm stall converter to get the performance I wanted (rough to park the car afterwards). I went from an average 14 with the standard to a consistent 12.6 - 1/4 mile with the TH350, not too shabby for a 16 yr old on a limited budget (84). That was with a single legged 3.73 or so rear. On a side note, That was nowhere near 1 mile above sea level, that was in Wichita, KS. I can't take anything away from those guys getting power at this altitude.

Not saying that is what you need for your combo, but some food for thought.

2007 JK Rubicon
5.5 Rock Krawler X-factor lift w/37 x 12.5 x 17 BFG KM2s, 5.13 Superior gears
Warn Powerplant HD

Last edited by Totallymetal; 05-11-2009 at 11:50 PM..
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