13:1 and pump gas?

[HP]

Im looking into a set of JE 1397 13:1 pistons, is this set up compatible with 92 or am I going to be detonating?

[AncientRgn]

if you mean pump gas, yes its compatible.

[Todd]

Those are the pistons I'm running and I go out of my way (9 miles one way) to get 93 octane.  Runs great!

Of course the alternative is 91 octane everywhere else.  Next closest 93 octane is the next state and 35 miles one way.  I would be afraid to go full throttle/redline with 91.  92 is borderline since I know of at least one 13:1 Busa owner who has had pinging in very hot weather even with 93.  I haven't noticed that myself but he's a full time drag racer.

I need the 93 for the Busa, turbo car and supercharged car so I'm starting to get used to the drive ....

[Scary-Jerry]

I threw a rod and damaged two other rod journals with pump gas and 13:1.  You won't hear the detonation!

[HP]

Yeah I almost went that route but after riding this weekend I not only think 200 rwhp is excessive but Its difficult trying to imagine riding a busa with a turbo as well.

Im just having the head sent off to a machine shop to get cleaned up, and a set of yosh cams installed along with the full airbox mod. Hopefully that will get me from 159 to possibly 180 with good tuning.

Thanks for the advice, even if I wanted the power the thought of having to route a second battery under my hump didnt excite me either. If I ever feel the need for more than 1 hp per 3 lbs Ill go with a turbo.

[Fast Frank]

firebusa
I have a Brock gen 2 pipe, small box mod,Yosh cams set at 103/105, PCII-I made 180-182, a few more w/ the "pair sucker"

If you can't get 180 h.p. w/ Yosh cams w/ out touching the head etc..There is a serious problem!

A friend of mine has a low compression 1397 that motorhead did for him and hasn't had any problems for a year and a half-now he is having some "issues" w/ starting it etc...

I was going to a 12:1 1397 w/ Wiseco's (still might) But, this is making me really think about it!

[HP]

Yeah Im hoping for 180, I got similar mods. Pair valve is gone, muzzy header/pipe, PC2, and Ill be doing the full airbox mod too. I am going with velocity's long stacks as thats what I heard is good for more power up top on a stock displacement motor.

I would really just add a dry nitrous set up and be done with it. You really dont need that kind of power on the street and it actually is less abusive on everything drivetrain related as well as you only use the power when you are at the strip.

If this isnt enough for me thats the direction Im going, dry nitrous only a 30 or 40 shot too.

[Johnnycheese]

you mean short stacks    
long better for low end grunt
short better for top end pull

[HP]

Yeah you think I should go with the short end stacks? I heard those are good for larger displacement, but I really dont need anymore tire spin coming out of the hole right now. Im having a barrel of moneys trying to modulate the wonderful hydraulic set up that those suzuki scientists have given us from the factory. I would rather have more power up top than more torque down low.

[Pat Dietrich]

quote:Originally posted by firebusa:
Yeah you think I should go with the short end stacks? I heard those are good for larger displacement, but I really dont need anymore tire spin coming out of the hole right now. Im having a barrel of moneys trying to modulate the wonderful hydraulic set up that those suzuki scientists have given us from the factory. I would rather have more power up top than more torque down low.

Read again. You will get more up top with all short stacks, you will lose some bottom end with short stacks. Less botom end, less wheel spin out of the hole!