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Old 08-18-2013, 07:44 PM
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Blower motor

I got a 350 sb chevy with a 6-71 blower. It's for the street only not for racing. I just got the car done and got bout 200 miles on it and have just been babying so far. But this weekend I got into a lil more and it starts to cut out at bout 4000 rpms. If I hit hard and the rpms go up fast it will pop out the exhaust. My timing is at 32. Do I need less timing or am I lean on fuel. I have heard timing should be 28 if u want to go higher rpms. I have an msd box that I can retard the timing but its set right now that 32 is lowest it will go....fuel or timing
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Old 08-18-2013, 07:53 PM
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Quote:
Originally Posted by Crazy57 View Post
I got a 350 sb chevy with a 6-71 blower. It's for the street only not for racing. I just got the car done and got bout 200 miles on it and have just been babying so far. But this weekend I got into a lil more and it starts to cut out at bout 4000 rpms. If I hit hard and the rpms go up fast it will pop out the exhaust. My timing is at 32. Do I need less timing or am I lean on fuel. I have heard timing should be 28 if u want to go higher rpms. I have an msd box that I can retard the timing but its set right now that 32 is lowest it will go....fuel or timing
Lots of blower guys needing help lately, all with no supporting info.
Start at the top, carbs, heads, valve train, springs etc, fuel supply, lines, ignition, what MSD box, compression, exhaust etc etc......
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Old 08-18-2013, 08:02 PM
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always start fat with a blower.
fbird88 likes the blower 350s.
a 6-71 should haul.
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Old 08-18-2013, 08:47 PM
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Is your MSD a BTM? If so, what chip is plugged into it? You might be going up agains the limiter. Is your fuel system up to the task, maintaining pressure at WOT?

How much timing a blower motor or any other for that matter will tolerate has many variables. How much boost are you running, what's your static c.r., what intake setup, when is your timing all in? Can you hear any detonation going on? Tough in a blower motor, don't ask how I know...

bgddy said it all, give up more details!
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Old 08-18-2013, 08:56 PM
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Yes, we need all the information on the motor. Could be simple as plug gap being too wide, and it could end up being a bunch more. Details, details, details please.
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Old 08-19-2013, 05:07 AM
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What are you using for a Fuel System ???
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Old 08-20-2013, 08:40 PM
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Well I built the motor with the help of a local engine builder prob bout ten years ago. So I'm not 100% what's what anymore. I do know its 8/1 compression with very good crank rods pistons. I know they are dart heads 202 and maybe 196???? Does sound right??. Everything was new top to bottom. I have bigger than needed exhaust system. And yes if I slowly go up on rpm's I can hear some detonation. Spark plugs r gap at 34 timing set at 32 locked in. I have two 450 Holley carbs built by k&b. I'm sure it's something simple that someone has had the same prob just thought I would try what ever u or someone has done. I just hate to lean a muti thousand dollar paint job and try something with the car and still not work. I guess where is the best place to start. Thanks guys
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Old 08-20-2013, 08:55 PM
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Well, 8.1 comp, 6-71 blower, dart heads, and 32 degees timing.
Start with this
http://www.msdignition.com/Products/...ng_Master.aspx
Then deal with the fact that your way way under carbed
Your asking if its fuel or ignition problems?
The answer is both.
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Old 08-20-2013, 08:59 PM
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Is the engine creating boost when you hear pinging? Detonation under boost equals disaster. You should have an ignition system that will pull timing down when boost increases - such as MSD 6BTM. Are you really running 450 cfm carbs????? - you should consider at least 650's and 750's would not be out of line. What grade fuel are you using?
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Old 08-20-2013, 09:37 PM
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Very first thing I would do would be install a wideband A/F gauge. A gauge would tell you instantly if your running too lean.
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Old 08-21-2013, 12:31 AM
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Ditto on the carburetors, I run two 750's on an 8-71 383 on the street, you need more.
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Old 08-21-2013, 06:55 PM
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are the carbs boost referenced. If not you will never get the extra fuel you need under load and the pinging could be due to lean mixture, not necessarily timing.
If you dont stop the pinging you will be doing the pistons soon. A wide band would be very helpful.
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Old 09-02-2013, 10:49 PM
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Times 2 on boost referenced carbs.
With out boost reference your power valve will never provide the extra fuel required at WOT.
Here is a link that may help.
How to: Modify Holley 4150 or 4160 Carburetors for a Blower Application
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