Boost and Pump Gas [Archive]

gotriver

11-19-2002, 10:50 AM

How much boost can you run on pump gas?
If it depends on certin combinations, what is a good combo? :confused:

Blown 472

11-19-2002, 11:41 AM

gotriver:
How much boost can you run on pump gas?
If it depends on certin combinations, what is a good combo? :confused: Check out kuhlsuperchargers.com in the tech section, all kinds of info on that stuff.

77charger

11-19-2002, 08:43 PM

I have the kuhl catalog and 10 pounds seems to be the limit.

Johnwithjm

11-19-2002, 08:46 PM

I run 9 all day long

Infomaniac

11-19-2002, 08:52 PM

gotriver:
How much boost can you run on pump gas?
If it depends on certin combinations, what is a good combo? :confused: A good and safe combo is 8 lbs with 8:1
or 10 lbs with 7.5:1 (my personal preference)
Depends on your compression.
[ November 19, 2002, 08:52 PM: Message edited by: Infomaniac ]

502procharger

11-19-2002, 09:40 PM

i run 7lbs with an intercooler and 9:1 comp. i have also run 9lbs with no problem. keep your total timing down a bit and you will be fine.

lakesmodified

11-20-2002, 09:55 AM

gotriver:
How much boost can you run on pump gas?
If it depends on certin combinations, what is a good combo? :confused: I'm running 10 PSI on 7:1.... But I do have water injection.

gnarley

11-20-2002, 10:12 AM

I see all you posting your compression and/or boost but using pump gas is a generic term. Depending what part of the map you go to the pump your octane varies significantly. So where are you & what octane do you regularly use with your compression, boost and timing??? Does it really matter if you use low-grade pump gas & your timing is 20 degrees?

Blown 472

11-20-2002, 10:18 AM

I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.

78Eliminator

11-20-2002, 10:25 AM

Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?

Blown 472

11-20-2002, 10:29 AM

78Eliminator:
Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?You can run that much comp if you want to run alky. Info would be the man on that.
A shot of n20 would kick ass on your boat.
Or sell and build a nice 7 to 1 motor and put a ton of boost to it. :D

78Eliminator

11-20-2002, 10:38 AM

Blown 472:
78Eliminator:
Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?You can run that much comp if you want to run alky. Info would be the man on that.
A shot of n20 would kick ass on your boat.
Or sell and build a nice 7 to 1 motor and put a ton of boost to it. :D I think I just decided what I'm going to do. I'm going to just buy a 300 shop of giggle gas and rig it for next summer. If I don't throw a rod, I will sell the engine just before next winter. By that time, I will have saved enough to build a nice blower motor. Ok, got it..... I just feel like a pussy without a blower.....

Blown 472

11-20-2002, 10:47 AM

78Eliminator:
Blown 472:
78Eliminator:
Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?You can run that much comp if you want to run alky. Info would be the man on that.
A shot of n20 would kick ass on your boat.
Or sell and build a nice 7 to 1 motor and put a ton of boost to it. :D I think I just decided what I'm going to do. I'm going to just buy a 300 shop of giggle gas and rig it for next summer. If I don't throw a rod, I will sell the engine just before next winter. By that time, I will have saved enough to build a nice blower motor. Ok, got it..... I just feel like a pussy without a blower.....That would look bitchen in your boat, feeling pussy?? well it kinda is a magnet for them. :D

gnarley

11-20-2002, 10:53 AM

[QUOTE]Originally posted by 78Eliminator:

I just feel like a pussy without a blower.....
Whats wrong not getting stroked? Well you know they say "you are what you eat", so I'd rather be a pussy than a dick eek!

DUCKY

11-20-2002, 11:00 AM

Infomaniac:
gotriver:
How much boost can you run on pump gas?
If it depends on certin combinations, what is a good combo? :confused: A good and safe combo is 8 lbs with 8:1
or 10 lbs with 7.5:1 (my personal preference)
Depends on your compression.I second that.

Liberator TJ1984

11-20-2002, 11:11 AM

Running 8.75 / 1 @ 6# 2yrs. no problems on AV-Gas
once @ 12% over =16# like I said ...only once..bad,bad,bad idea frown

Blown 472

11-20-2002, 11:12 AM

Liberator TJ1984:
Running 8.75 / 1 @ 6# 2yrs. no problems on AV-Gas
once @ 12% over =16# like I said ...only once..bad,bad,bad idea :(do tell???

78Eliminator

11-20-2002, 11:15 AM

He must have rattled it to hell. Nice bottom end test :p

Infomaniac

11-20-2002, 12:26 PM

78Eliminator:
Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?That is perfect for alcohol. If you do not want to run alcohol, I will be glad to build a pump gas blower deal for you.

78Eliminator

11-20-2002, 12:36 PM

Infomaniac:
78Eliminator:
Blown 472:
I use amaco 93 octane, in my car which is 7.7 to 1 at nine pounds of boost, my boat is 8.3 to 1 and I use a mix of 93 and 110 race gas and nine psi in that too.I know I had this conversation with you before, but am I crazy to bolt on a blower with 11:1 compression? With my setup, would N2O be better? The thing is, I really want a blown motor. I mean, I want to push my boat a lot faster and I am only making at best 650 hp. I want over 1000. Should I start thinking of crate engines and sell my current motor to finance it? Opinions?That is perfect for alcohol. If you do not want to run alcohol, I will be glad to build a pump gas blower deal for you.How much is alcohol per gallon? So, I could just get a cam and a blower, fatten up my jets and done deal (in a nutshell).

gnarley

11-20-2002, 12:54 PM

How far do you want to go or run, & if you run out where you going to fill up?

78Eliminator

11-20-2002, 12:57 PM

gnarley:
How far do you want to go or run, & if you run out where you going to fill up?That's kinda what I was thinking. I want to be able to cruise aimlessly up the river and fill up at the dock. Shit, looks like I might have to do some trial and error work on my current setup. What I still need to do is pull the motor and determine what compression ratio I am running. Can't really do anything until I know what I have... The previous owner knew nothing.

Liberator TJ1984

11-20-2002, 12:59 PM

Justin, I was going to think about alcohol myself..it is about $ 60.00 a Drum but you use twice as much as gas..looking at running injected.but way too much stuff for me to change over for now..
ps..@ 16 # got lucky and only lost head gaskets,but what a rush for those precious few seconds !!!! wink

gotriver

11-20-2002, 01:40 PM

OK, now that we have sorted that all out...........
How does the size of the blower affect boost. Does a 10.71 spin slower than an 8.71 to obtain the same amount of boost?

Liberator TJ1984

11-20-2002, 02:00 PM

yes , the biger the blower the more air it moves, therefore you don't have to beat the hell out of the air to make boost..spinning a small blower fast to make psi..just creates excessive and unwanted Heat..

gotriver

11-20-2002, 02:32 PM

Thanks for all the info.
Setting up a motor now with the help of GS Marine

eliminatya

11-20-2002, 02:42 PM

john, what is your static compression on the deck boat i thought i remember you saying 8:1 but cant' remember for sure. i'm running 8lbs on 8.8:1 with a 50/50 fuel mix, but i'm thinking once i get the intercooler i can run 8psi on 91. oh yeah are you running 9 psi with 91. thanx. sam