Boost question
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From: All humans are vermin in the eyes of Guru VA
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Boost question
why are turbo people running all kinds of boost without detonation but a blower is limited to only a couple of PSI?
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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Re: Boost question (Guru_4_hire)
why are turbo people running all kinds of boost without detonation but a blower is limited to only a couple of PSI?
Besides, with superchargers you are using HP to make boost, maybe more PSI robs more HP?
Try asking in the C4 Forced Induction forum, because I am just guessing and pulling thoughts out of my azz.
[Modified by BSeery, 4:51 PM 10/26/2003]
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From: All humans are vermin in the eyes of Guru VA
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Re: Boost question (BSeery)
I ask because I am looking at the weiand technical info webpage about their blowers. and the 6-71 kit for a small block comes with pulley systems for 12psi of boost or 10.5% underdriven.
with 7.5:1 blower pistons I can only take 8-10psi of boost, at least according to their webpage. They also want you to o-ring the block and all kinds of other things going on.
Maybe Norvalwilhelm or 69rat can add more to the conversation.
with 7.5:1 blower pistons I can only take 8-10psi of boost, at least according to their webpage. They also want you to o-ring the block and all kinds of other things going on.
Maybe Norvalwilhelm or 69rat can add more to the conversation.
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From: All humans are vermin in the eyes of Guru VA
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Re: Boost question (Guru_4_hire)
http://www.chevyhiperformance.com/techarticles/48499/
here is an article that says they ran 9 psi of boost on 8.5 compression. which comes out to be alot higher than the 12:1(13.x:1) effective compression ratio
which weiand says in safe.
so similiarly the 12psi of boost would put me in the same range as this motor on an effective compression ratio, on a 350....
here is an article that says they ran 9 psi of boost on 8.5 compression. which comes out to be alot higher than the 12:1(13.x:1) effective compression ratio
which weiand says in safe.
so similiarly the 12psi of boost would put me in the same range as this motor on an effective compression ratio, on a 350....
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From: Waterloo ontario Canada
Re: Boost question (Guru_4_hire)
I run a boost retart system form MSD. As boost goes up the timing comes down. I am running an effective compression ratio of almost 15 to 1 with 12 pounds of boost.
Turbo charging and supercharging do run intercoolers but of the 3 I think the blowers are the easiest to install.
With a proper cooling system you do not have a problem with overheating but after hours of driving you do notice the heat build up in the blower. The amazing part is the carbs are always cold. Even after hours on the expressways the carbs are still cold to the touch and gas mileage doesn't have to suffer. My bigblock is pulling down 14.4 with a combination highway and town driving.
Turbo charging and supercharging do run intercoolers but of the 3 I think the blowers are the easiest to install.
With a proper cooling system you do not have a problem with overheating but after hours of driving you do notice the heat build up in the blower. The amazing part is the carbs are always cold. Even after hours on the expressways the carbs are still cold to the touch and gas mileage doesn't have to suffer. My bigblock is pulling down 14.4 with a combination highway and town driving.
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From: All humans are vermin in the eyes of Guru VA
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Re: Boost question (Guru_4_hire)
http://www.whipplesuperchargers.com/...sp?ProdID=1158
here is a really low profile intercooler from whipple that would work but its 3 grand. its about 1 inch tall......
here is a really low profile intercooler from whipple that would work but its 3 grand. its about 1 inch tall......
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From: All humans are vermin in the eyes of Guru VA
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Re: Boost question (norvalwilhelm)
So the ignition retarding device will help with the problem?
would something like the blow off valves they have for decelleration?
would something like the blow off valves they have for decelleration?
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From: Waterloo ontario Canada
Re: Boost question (Guru_4_hire)
We don't use blow of valves for deceleration. We do have a pop of valve in the event of back fire but it is closed all the time.
I run 42-43 degrees timing for light cruising but as the boost builds it pulls about 1 or 2 degrees per pound of boost out of the motor.
On 94 octane I don't hear detonation at full boost but put in low test, without the Tee tops on and you hear the detonation if you push the motor.
3 grand for an intercooler is not worth it.
Under normal driving conditions heat is not a problem and if you are racing the blower doesn't operate that long to build up the heat.
Guys alot of this is just excusses not to do something. I would do it but?
Buy a blower and you will not regret it. You can't go back. Even my wife loves her blown bonneville and will not accept another normal car.
I run 42-43 degrees timing for light cruising but as the boost builds it pulls about 1 or 2 degrees per pound of boost out of the motor.
On 94 octane I don't hear detonation at full boost but put in low test, without the Tee tops on and you hear the detonation if you push the motor.
3 grand for an intercooler is not worth it.
Under normal driving conditions heat is not a problem and if you are racing the blower doesn't operate that long to build up the heat.
Guys alot of this is just excusses not to do something. I would do it but?
Buy a blower and you will not regret it. You can't go back. Even my wife loves her blown bonneville and will not accept another normal car.
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From: All humans are vermin in the eyes of Guru VA
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Re: Boost question (norvalwilhelm)
I am really motivated to do it. I am just trying to engineer it correctly so I dont break anything. I am also trying to not over engineer it to the point it busts the bank.
what about mid grade - I am limited to 87 91 93 octane. How does it like 91 octane?
[Modified by Guru_4_hire, 8:16 PM 10/26/2003]
[Modified by Guru_4_hire, 8:17 PM 10/26/2003]
what about mid grade - I am limited to 87 91 93 octane. How does it like 91 octane?
[Modified by Guru_4_hire, 8:16 PM 10/26/2003]
[Modified by Guru_4_hire, 8:17 PM 10/26/2003]