anyone running 33cc domes?? help

[grunty13]

can you use pump gas with 33cc domes on a ADA girdled head for a 04 SJ701

 

[B-Roy]

35cc

 

[C-Rock87]

yes, you can.

 

[Shonuff]

yes, you can.

. . . if that pump is pushing out 105 octane. :cool2:

Otherwise, stick with 35cc to give about 185psi. Those 33ccs will probably put you over 200psi.

 

[Matt_E]

Stock porting, stock ignition, no absolutely not.

 

[C-Rock87]

Stock porting, stock ignition, no absolutely not.

aren't you running 33's matt? does a port job let you run lower octane?

 

[B-Roy]

A port Job lowers your compression, which in turn lets you run lower octane.

 

[C-Rock87]

A port Job lowers your compression, which in turn lets you run lower octane.

k...learn something new everday. I was confused because paul said with my build i'll be able to run my 33's on pump gas not realizing it was because of my porting.

 

[cambo au]

my 33cc domes put me at 200psi i would not run it on pump feul
i run 34.5cc just a tad over 185
no porting

 

[Shonuff]

my 33cc domes put me at 200psi i would not run it on pump feul
i run 34.5cc just a tad over 185
no porting

Yep, my 33s put me at 215 :skull2:

I immediately pulled them for 35s. (185)

 

[Matt_E]

aren't you running 33's matt? does a port job let you run lower octane?

Yup, 33cc domes on 82mm bore.
My porting lowers the cranking compression to about 178psi or so. I believe Paul's freestyle porting does something similar.
But I also run TL, which gives me additional safety on top.

 

[YAMA CAT]

I have 33cc Domes@ 210psi 82mm Ported w/Dry Pipe. 93/110 mix = 101 Octane I wouldn't chance it on Pump gas.

 

[Matt_E]

I wouldn't either @ 210 PSI. :biggthumpup:

 

[YAMA CAT]

Yup, 33cc domes on 82mm bore.
My porting lowers the cranking compression to about 178psi or so. I believe Paul's freestyle porting does something similar.
But I also run TL, which gives me additional safety on top.

Do you have gopfer holes for porting?

 

[Matt_E]

:lmao:

No, I don't.

 

[YAMA CAT]

Matt,

I was just curious. Both of are motors very similar but the compression readings are drastically different 178psi vs. 210psi. Would it make a difference between 62T / 61X cylinders with port timing? Guys teach me something:biggrin:

 

[Matt_E]

I did not raise the exhaust ports, but when I widened them, I also brought the corners out and up, effectively raising the corners of the port. So, that lowers the cranking compression.
My bore is definetely not fresh. In fact, I don't know how old it is.
Compression would likely go up a bit on a fresh bore.
I am at approx. 2500ft above sea level - that lowers the compression.
If I think of it, I'll do a test this weekend at the coast.

My gauge is a Schuck's cheapo, so it may well be off.

 

[YAMA CAT]

That all makes sense.:smile: We use a le cheapo gauge too. :biggrin: