450r 13.5.1 comp on pump gas?

[accorracer]

did a search first couldn't find the info. will a 450r w/ 13.5.1 comp piston run on pump gas or is it just an accident waiting to happen?

[Scro]

I run straight C12 in mine, but I have heard of people mixing it 50/50 with 93 pump gas on that compression.

[czrider263]

I would suggest runing a mix of 1/2 pump to 1/2 race gas at the least. I run stright race gas.

[accorracer]

thats what i figured

i was looking at getting a 450r with a lot of work done. but i wanna run pump gas

thanks for the input

[patrickj75]

i heard from Joe at Rossier that 12:1 is the most you can run on straight pump gas.

[chad502ex]

not enough info from you to determine if you can run pump or not.

what determines if an engine can run pump gas or not is NOT from the static compression ratio, it is from the DYNAMIC compression ratio.

DYNAMIC compression ratio is determined when the intake valve closing after BDC.

sure, one can GUESTIMATE whether STATIC compressio ratio can be ran on pump, but without knowing what cam with the STATIC compression it the biggest most common error one can make.

[450R_lover]

So Chad... What would fuel or mixture of fuels would you recommend for this guy to use?..... And what about someone like me that has a 13:1 compression ratio that is thermal coated?... would i be better off running 50/50 of 93 and 103????


Thanks... just getting some more out of ya :p

[chad502ex]

Originally posted by 450R_lover
So Chad... What would fuel or mixture of fuels would you recommend for this guy to use?..... And what about someone like me that has a 13:1 compression ratio that is thermal coated?... would i be better off running 50/50 of 93 and 103????


Thanks... just getting some more out of ya :p


50/50 93 and 110 for you.

but the thread starter asked the question without all the information to be able to properly answer it,..

[450R_lover]

yeah i understand .... thanks for responding man.. your a really smart fella... ;)
Oh yeah ... could i just run straight 103 instead of a 50/50 mix of 93 and 110? wouldnt that be about the same as 110?

thanks

[compedge]

I have the 13:1 je piston and the hotcam2. I havent had time to put the motor together yet . Im ganna try this.
www.torcoracefuels.com/catalog/product_info.php?cPath=22&products_id=28

[iceracer65]

Originally posted by chad502ex
not enough info from you to determine if you can run pump or not.

what determines if an engine can run pump gas or not is NOT from the static compression ratio, it is from the DYNAMIC compression ratio.

DYNAMIC compression ratio is determined when the intake valve closing after BDC.

sure, one can GUESTIMATE whether STATIC compressio ratio can be ran on pump, but without knowing what cam with the STATIC compression it the biggest most common error one can make.

i have this piston on order and want to run pump gas.

i have an HRC cam, dyna ignition, and a ported head with the combustion chamber relieved.

i plan on cc'ing the head to try some of the compression ratio calcualators on line.

[accorracer]

i'll try to get more info. its on a bike that i am looking at purchasing. so i don't know the entire setup

although i will try to get the rest of the specs

[chad502ex]

Originally posted by iceracer65
i have this piston on order and want to run pump gas.

i have an HRC cam, dyna ignition, and a ported head with the combustion chamber relieved.

i plan on cc'ing the head to try some of the compression ratio calcualators on line.

sounds like a real scream. let us know what you pop on the dyno after it's done. If no dyno, tell us about the butt dyno in your words. Good luck!

[iceracer65]

chad, do you think i can get away with running pumpgas with that setup?

just looking for opinions.

[kawasaki_ridah]

i have a JE high compression piston and stage 2 cam and my bike has 13:1 I was always told to run like most of these guys posted on half race and half 93

[chad502ex]

Originally posted by iceracer65
chad, do you think i can get away with running pumpgas with that setup?

just looking for opinions.

a bit too much for me at 13.5:1 with HRC on straight up cam timing.

To be safe, I would run 50/50 mix or at least 10% acetone by volume to raise octane ~5 points. Only what i would do on stright up cam timing...

Of coarse, I wouldn't be running hrc straight up cam timing,...

[ubnpast]

Of coarse, I wouldn't be running hrc straight up cam timing,...

Chad, what timing would you run then?

[chad502ex]

Originally posted by ubnpast
Chad, what timing would you run then?

twisted back a few degrees with 14:1 to make up from bottom end loss with retarded cam timing,

[iceracer65]

Originally posted by chad502ex
twisted back a few degrees with 14:1 to make up from bottom end loss with retarded cam timing,

on pump gas??

[chad502ex]

Originally posted by iceracer65
on pump gas??

not preferred, but if i were trying to get back to the truck i would- especially, with high overlap HRC and twisted back cam timing then yes in a heartbeat for me.


remember, what determines pump gas requirements is cam overlap and where the intake valves close BTDC..

[iceracer65]

Originally posted by chad502ex
not preferred, but if i were trying to get back to the truck i would- especially, with high overlap HRC and twisted back cam timing then yes in a heartbeat for me.


remember, what determines pump gas requirements is cam overlap and where the intake valves close BTDC..

i was trying to set mine up to run only on pump gas.

thanks for the info.

[compedge]

If you want to play it safe run the 12:1. Im ganna try a few diffrent things with my 04 with 13:1.