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Unread 05-11-2009, 04:54 PM   #1
scamaro355
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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
Andy5150
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2003 TJ Wrangler 
 
Join Date: Nov 2005
Location: Palm Harbor, Fl.
Posts: 542
Sounds like carb jetting, and/or ignition timing/curve; need more info.
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Unread 05-11-2009, 06:10 PM   #3
scamaro355
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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
Totallymetal
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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.
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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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