9.4:1 Compression with a Blower?
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
9.4:1 Compression with a Blower?
So I guess that running a thicker head gasket to get me down to 8.5:1 was a bad idea, as I would have improper quench.
So can I run a 177 blower with 9.4:1 compression on a 383 with 91 octane? How about with methanol injection? How much boost do you guys think I'll be able to run? Will I be able to get a Weiand 177 to spin slow enough to make that boost?
So can I run a 177 blower with 9.4:1 compression on a 383 with 91 octane? How about with methanol injection? How much boost do you guys think I'll be able to run? Will I be able to get a Weiand 177 to spin slow enough to make that boost?
Burning Brakes
Joined: Nov 2003
Posts: 990
Likes: 0
From: North Texas
Sure you can run the 177 but you will be limiting the amount of boost you can run.
I run a Whipple on a Vortec 350. It is 9.4 to 1 compression and I have alcohol injection system so I could increase the boost levels.
Your starting to make some trade offs. Your now trading boost for compression - remember they both make power.
You can also run Boost retard unit to pull timing as you increase the boost levels.
Just remember, there is a lot of tuning involved - don't get frustrated. It takes time.
I run a Whipple on a Vortec 350. It is 9.4 to 1 compression and I have alcohol injection system so I could increase the boost levels.
Your starting to make some trade offs. Your now trading boost for compression - remember they both make power.
You can also run Boost retard unit to pull timing as you increase the boost levels.
Just remember, there is a lot of tuning involved - don't get frustrated. It takes time.
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
I've thought about that, but refilling nitrous is a lot different than refilling a methanol injection system with windshield washer fluid. When I drive the Vette, I drive it to have fun. I would be going through nitrous bottles like crazy, at $40 a bottle or whatever it is that can be painful. Windshiled washer fluid is cheap, and I wouldn't have to drive 20 mins to get the bottle filled up.
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Plus nitrous is a WOT application. Blower will give you power across the RPM band. Personally I don't think nitrous belongs on the street unless you are driving something so under powered you need it for passing. Unless you are building it for racing, leave nitrous to the punk tuners and build yourself a real engine.
Last edited by KJL; Nov 7, 2007 at 10:41 PM.
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
I put over 150 runs on my 454 last year; 95% were nitrous runs and of those 90% were a 250 hit and above, up to approx 375 hp. I never hurt a plug, piston, bearing, etc. Check my sig for times. It is your inability to tune nitrous that turns you off from it, not that nitrous its self is unreliable.
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Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Have you ever run nitrous ??
I put over 150 runs on my 454 last year; 95% were nitrous runs and of those 90% were a 250 hit and above, up to approx 375 hp. I never hurt a plug, piston, bearing, etc. Check my sig for times. It is your inability to tune nitrous that turns you off from it, not that nitrous its self is unreliable.
I put over 150 runs on my 454 last year; 95% were nitrous runs and of those 90% were a 250 hit and above, up to approx 375 hp. I never hurt a plug, piston, bearing, etc. Check my sig for times. It is your inability to tune nitrous that turns you off from it, not that nitrous its self is unreliable.
or it will destroy your engine , its just not what I want, it is a cheap
way to make power no doubt.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Ah come on its easy on the forum for me to spend your money
and time.
Seriously though I'm guessing even a
mini blower kit is around two grand, I would be damned if I would
buy one to only be able to use 3 or 4 pounds of boost, before that
would happen I would run around with nitrous, I would do it with
dropped compression and whatever supercharger would allow me
to go with at least 10 pounds of boost. I'm guessing it would take a 6/71
to end up with 10 pounds on a 383 size small block, or the old B&M
250 mini blower kit for large small blocks. I notice weiand has a
250 mini replacement main blower housing for what they call big small blocks.
and time.
Seriously though I'm guessing even amini blower kit is around two grand, I would be damned if I would
buy one to only be able to use 3 or 4 pounds of boost, before that
would happen I would run around with nitrous, I would do it with
dropped compression and whatever supercharger would allow me
to go with at least 10 pounds of boost. I'm guessing it would take a 6/71
to end up with 10 pounds on a 383 size small block, or the old B&M
250 mini blower kit for large small blocks. I notice weiand has a
250 mini replacement main blower housing for what they call big small blocks.
Last edited by Little Mouse; Nov 8, 2007 at 04:03 AM.
Racer
Joined: Apr 2007
Posts: 361
Likes: 0
From: Sacramento (Citrus Heights) California
"Bottles are for babies." is a quote that floats around in the VW communities from time to time. Makes me chuckle whenever I see it.
Anyway, I say you should stick a blower or a turbo on there and have fun if you're like me and want minimal operating costs with about the same amount of fun.
Anyway, I say you should stick a blower or a turbo on there and have fun if you're like me and want minimal operating costs with about the same amount of fun.
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
Do you need to do this right now? Save your money and make the necessary changes so the thing will run halfway decently with forced. Or run nitrous, you've got a great platform for that.
Last edited by shafrs3; Nov 8, 2007 at 08:19 AM.
