Dome and Jet Questions

[4millshee]

hey all ive been out of the game for a while (military) and finally have time to get the shee back up and runnin. ive got a 65mm bore with dune port, pwk 35's , noss head with 20cc domes. im sure i will need race gas but will i need pure race gas or will a 50/50 mix be suffice? also im at 1000' elevation and just looking for a starting point for jetting. hope yall can help out and thanks in advance.....

[sleeper06]

Gas will depend on compression,but if its a 4mill duneport with 20s you should kick around 185psi,your port work will effect your compression so check it first,IMO anything over 165 i run pure 110 its safe with +4 timing.Start at 160 main,48 pilot,cel needle 4th clip

[4millshee]

ahh i forgot to mention that its no longer a 4mill its got a stock stroke weisco crank

[Larry's Shee]

have you had it running since you went back to stock stroke?

[4millshee]

I have not is been down for 2 years and just now got time to get it going again

[sleeper06]

hopefully you are using diffrent cylinders the port heights will be off some on 4mil jugs

[4millshee]

No I am still using my 4 mill cylinders I just took a hard stone grinder and ground them down till they fit good with the shorter stroke. And for the porting I coated them with some quick dry jb weld and sanded them by hand to what I thought looked good...... Come On guys lol I'm not stupid I have the right shit on the motor I just wanted to know some rough estimate jet help lol

[Pasi S.]

What pipes?

 

I have 64.5 ported stock cyls with Noss Head/20cc domes. It has zero riding time with my resent mod´s, but I was going to start with 155 mains, 42 pilots and CEL in the middle. I also have 35PWKs.

My porting was not made by any Professional.

 

-Pasi S.

[4millshee]

Toomey T5s and I ordered some parts from fast and Jeff said 155 160 range would be a good starting point. Let me know how yours runs like that

[camatv]

what did you "grind down??

 

where did you put "epoxy at?

 

if the motor was set up for pop up domes and 115 rod the port numbers on a stock stroke std dome motor willbe close enough it should run fine..

[4millshee]

Ok I didn't really epoxy or gring anything it was a joke for thinking I would use 4 mill jugs on a STD stroke

[Pasi S.]

Toomey T5s and I ordered some parts from fast and Jeff said 155 160 range would be a good starting point. Let me know how yours runs like that

 

 

OK, we have same pipes.

Last year my porting was "un -finished" and it was missing seriously low end and it was peaky. In the winter time I had a 160 mains, xxx needles in the middle, and 42 pilots 1 or 1.5 turns out, and that was -4*C.

In the summer time I was using 150(+32*C) to 155 and 40 pilots 1.5 to 2.5 turns. ( I didn´t have any smaller mains or pilots, and I was using a different needle in the summer time)

 

Now I´m going to have a smoother powerband, because I have finished my porting. I don´t know anything about the CEL´s with those small pilots, but let´s see...

If everything goes well. My motor runs in the middle of the next week.

 

-Pasi S.

[papa-smurf]

Gas will depend on compression,but if its a 4mill duneport with 20s you should kick around 185psi,your port work will effect your compression so check it first,IMO anything over 165 i run pure 110 its safe with +4 timing.Start at 160 main,48 pilot,cel needle 4th clip

 

Mistake...you can delete post

Edited July 9, 2011 by papa-smurf