Porting pix please
05-04-10, 02:07 PM
#1
Porting pix please
ok i have a 85 GSL-SE and im doing a rebuild and a mild street port. im worried about how deep i can go on the "extended" parts of my ports. I would like to see many porting pix so i have some referance on how deep i can go with it. yes this will be my first porting job. and i have 2 engines one for practice. but i would like to keep them both able to run. i have searched the forums and couldn't find many.
Thank you,
Thank you,
05-09-10, 07:14 PM
#4
GSLSE end plates pictured.
If you want to port it then you're seeking higher rpm power. The GSLSE has lower compression (9.2) and heavy rotors and flywheel which equate to very good midrange torque. If you want to rev it I would suggest S5 n/a rotors combined with a light flywheel and recurve the distributor to bring the advance in a little sooner. I rode in one with a combination much like this and it was pretty sweet. I would then go to 4.44 gears and a S4 or S5 n/a tranny swap to compensate for the 5th gear rpm change. Would make a great daily driver!!
If you want to port it then you're seeking higher rpm power. The GSLSE has lower compression (9.2) and heavy rotors and flywheel which equate to very good midrange torque. If you want to rev it I would suggest S5 n/a rotors combined with a light flywheel and recurve the distributor to bring the advance in a little sooner. I rode in one with a combination much like this and it was pretty sweet. I would then go to 4.44 gears and a S4 or S5 n/a tranny swap to compensate for the 5th gear rpm change. Would make a great daily driver!!
05-10-10, 02:55 PM
#5
GSL-SE rotors are the same compression as S4 na rotors. 9.4:1. They are heavier though. The S5 rotors are the lightest and are 9.7:1. Realistically it's not that compression boost which gives the power. It's the loss of weight. Rotating component weight has nothing to do with torque of any kind. It never has and never will.
05-10-10, 09:39 PM
#6
Heavier weight will provide a better launch, more inertia stored in the drive-trains rotating mass. Lighter weight provide better upper rpm potential and the engine will rev quicker. I have had 3 combination's in my car, all with the camden. First, a s3 13b stockport, then a s3 13b streetport with s5 rotors and s5 flywheel, then a s4 4 port 1/2 bridge with s6 rotors and s5 flywheel, and finally a streetported s4 4 port with a stock s4 flywheel. I noticed differences relevant to rotating mass with each (and of course difference due to porting as well).
05-11-10, 04:12 PM
#7
I've had multiple combinations too. Lighter is faster. A heavier rotating mass (to a point) is only beneficial for a hard launch on a drag strip but drag racing really is an insult to a car designed to turn corners anyways. Lighter isn't even hard to drive on the street.
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05-11-10, 09:16 PM
#8
Personally I like to rev the rotary and would prefer the s5 rotating assembly, streetport and light flywheel with the streetport exhaust in a gslse. Personally, i would even like to experiment with smaller injectors and add 2 more injectors controlled by a basic haltech f5 which can be picked up cheap. Then re-curve the distributor as well.
