How high of compression?

rollin5150

rollin5150

Location
Idaho
How high of compression can I go with a SXR modded with the FFP wetpipe, 6 degree timing advance jumper, and stock ignition before the advance is to much and deto occures? Right now I am at 150# per cylinder and was thinking of bumping up to around 170-180. If I cannot go up this high, will the higher compression give me more pop than the timing advance?
 
DAG

DAG

Yes, my balls tickled from that landing
Location
Charlotte, NC
what grade gas do you want to run on your current ignition?

i would be leary running 180psi on 83
 
M

mx595

X
Timing and compression #'s change drastically when adding a pipe...

To be honest with you, 180 lbs. compression w/dry pipe and 6 degree timing advance is already pushing it. Especially with finish timing. The nice thing about the Advent is you can pull some timing back up high from say 6800 till redline.
I'm not sure how close to deto 180 it is with a wet pipe and 6 degreee advance.

Adding dual cooling can help w/fighting increased temps. It's very simple to do and can help save a motor from popping if used for extended wot runs.
 
rollin5150

rollin5150

Location
Idaho
mx595 said:
Timing and compression #'s change drastically when adding a pipe...

To be honest with you, 180 lbs. compression w/dry pipe and 6 degree timing advance is already pushing it. Especially with finish timing. The nice thing about the Advent is you can pull some timing back up high from say 6800 till redline.
I'm not sure how close to deto 180 it is with a wet pipe and 6 degreee advance.

Adding dual cooling can help w/fighting increased temps. It's very simple to do and can help save a motor from popping if used for extended wot runs.
Click to expand...

Thanks for the info. What you stated is what I am concerned about. I think if I go that high, I will be at the edge and I really don't want to be there. I have been playing around with the idea for dual cooling as well. Are you talking about the dual cooling where one feed goes to the headpipe and the other to the manifold, head, and cylinders? Isn't true dual cooling where you actually tap into the cylinders and push water in there as well?
 
jrslim84

jrslim84

Location
st.pete
dont do daul cooling with a wet pipe unless your motor is insane i have alot of work on my ski and had daul cooling and took it to team scream and they took it off said it was too much cooling my comp is 180 jsu head wet pipe reed spacers daul fuel pumps tdr water box msd coil advent ing advent tl flywheel and more just my two cents
 
M

mx595

X
If you have a Advent you can control your own destiny within reason.

Dual cooling would be one for the motor and one for the pipe. No need to tap the cylinder for your application.

Dual cooling can be too much depending on what you have for mods, but you can also make up for it with running restrictors in the right places.
 
rollin5150

rollin5150

Location
Idaho
All great info. Thanks everyone for responding. I am going to play with the water fittings on the pipe some more and see if I can get what I feel is where it should be. If I cannot find it then I may just bump up the compression and maybe take out the advance jumper and see where that takes me. I am really trying to avoid the aftermarket ignition at this point.
 
M

mx595

X
170 is safe all day long. 180 is when you start to "push it" when you add the timing advance.

Again I'm not sure how similar it is for the wet pipe vs. dry. I only have experience with the dry and racing situations ie wot.
 
rollin5150

rollin5150

Location
Idaho
global warmer said:
my sxr's stock comp is at 185,that's stated in the service manual and same on the guage i have,am i lucky?my concern is how to choose an aftermarket head as i would like a girdle kit for peace of mind with my wet pipe!
Click to expand...
I like my ADA head and girdle kit. The 30cc domes kept me at stock compression.
 
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