Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: craig on January 23, 2006, 01:35:52 PM

Title: cj7 engine
Post by: craig on January 23, 2006, 01:35:52 PM
Working on 78 4.2l straight 6 cj7 at the moment, or i think it is a 4.2l?how do you tell the differance between 4.2l and 3.8l? can anyone advise me what the height of the pistons at tdc from the top of the block should normally be? as i have the head removed and they seem to not come up enough?  Its only running at 90psi and i think this may be a little low? Also there is no back pressure surgesing its not breathing into sump? Engine has had overhaul in its life so not sure if it has been built up with the wrong pistons/rods? Any help/surgestions would be gratefully received..
Title:
Post by: Bubba on January 24, 2006, 06:05:17 AM
cast in to the side of the block it will have 232  or 258 till you know this you is shootin in the dark
Title:
Post by: craig on January 24, 2006, 01:12:41 PM
have had a gander and its a 258 mate...
Title:
Post by: chrisjones on January 24, 2006, 01:20:11 PM
Then it is a 4.2
Title:
Post by: Anonymous on January 24, 2006, 01:27:08 PM
Quote from: "chrisjones"
Then it is a 4.2


Why???

How does 258 translate to 4.2?

Just curious
Title:
Post by: chrisjones on January 24, 2006, 01:41:08 PM
258 cubic inches = 4.22........(an a bit) Litres. :wink:
Title:
Post by: Anonymous on January 24, 2006, 01:43:53 PM
Ahhhhh :)

Cheers

*Hand chris his anorak*  :lol:
Title:
Post by: chrisjones on January 24, 2006, 01:47:14 PM
:lol:
Title:
Post by: monkeybiz on January 25, 2006, 08:00:22 AM
1000 cc is approx 60ci for easy calculations
Title:
Post by: isle of man on January 25, 2006, 08:36:33 AM
strange but that is aproximetly  the same as the $ to £ exchange rate at the moment......



peter henry