Is anyone else here running a 79mm bore d-series? My JG sleeved 79mm d16a6 cracked the aluminum around the iron sleeve (which was thin as all hell--ever since I got the block I thought it was to thin) I have had so many problems with this block from day one. It cracked right between 1 and 2--and the HG couldn't hold. I took the head off and since the crack was barely visible and wasn't in the actual iron I got another HG and put it on. the compression test checked out ok with the new HG but when running the #1 cylinder was leaking pressure. Tore it back down and am pulling the motor right now. This was a 13:1 NA application. Even if I got the most bulletproof sleeves (which these were not) I don't think I would ever do 79mm again--its just way too thin between the cylinders--reguardless of how thick the sleeves are around the water jacket. I literally got less than 100 miles out of this POS. I wanted to go 79 because it came out to 1763cc--but its just not worth it. I am transferring everything out of that motor except for pistons (obviously) bearings, HG -into a fresh d16a6 block bored to 75.5mm. I just want to know who else has a 79mm d16? How long did it last you? Who sleeved the block? Would you ever do it again? I will have pictures up later tonite or tomorrow.

 

bump

would like to hear some experiences with this.

 

I know of one other guy on here who has a 79mm d16z6 JG motor--he is actually selling it. there is a dyno run on JGs site of it--made 228 hp at the crank. Pretty nice build--I just don't trust 79mm d16s.

 

made that power with 12:1 compression on 100 octane.

 

Yup fully built JG 79mm. I ran it a few times in my hatch, i had a ignition problem was falling on its face on to end. Still ended up running 8.2 in the 1/8th @83/84mph then on top it ran 14.0 at 92mph. In Steele,AL Nopi Comp 4 race. After i got home found the problem but never got back on the track thanks to Hurricane Katrina. No probelms out of it very strong motor.

 

You have the JG sheet metal intake? Not the Jg/edelbrock, right?

 

thats correct, i have the sheet metal intake not the JG/Edelbrock one. W/65mm tbi and camp 440cc inj.