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Old 11-12-2008, 10:36 PM
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more weiand 144 ?'s

OK so I"ve been reading a ton of stuff online and seem to find a million different opinions on these things. From what I've read here some of you acutally have experience with this blower. Here is my setup

77 2wd k5 blazer
77k orig 4 bolt motor
weiand 144
Crane Cams 113801
http://store.summitracing.com/partde...1&autoview=sku
roller tip rockers and gasket matched heads (soon to be changed)

My questions being
how many hp I can expect? I'm guessing around 350?
can I use my quadrajet until I can get some more $$ for a new carb?
any tips for tuning? timing ....

Thanks in advance for any help

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Old 11-13-2008, 05:28 PM
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Oh yeah and it will be running about 6 lbs boost. thanks
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Old 11-13-2008, 05:36 PM
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You can expect about a 35% gain with stock pulleys. If you have cast pistons you are playing with fire. Blower motors like more initial timing and a total of about 38. Any carb you use will need to be setup for the blower to work properly and protect the engine internals.

I have a 142 and the difference between the blower and the NA engine was unreal. I destroyed my cast pistons with a litttle to agressive timing curve. What is your current compression ratio. 9:1 is about the max you can have with stock parts or you will blow it up.8:1 is a better starting point.

Chet
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Old 11-13-2008, 06:39 PM
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Quote:
Originally Posted by cochino12
OK so I"ve been reading a ton of stuff online and seem to find a million different opinions on these things. From what I've read here some of you acutally have experience with this blower. Here is my setup

77 2wd k5 blazer
77k orig 4 bolt motor
weiand 144
Crane Cams 113801
http://store.summitracing.com/partde...1&autoview=sku
roller tip rockers and gasket matched heads (soon to be changed)

My questions being
how many hp I can expect? I'm guessing around 350?
can I use my quadrajet until I can get some more $$ for a new carb?
any tips for tuning? timing ....

Thanks in advance for any help
use the highest available fuel octane. 92 octane or better.
You can make your own 100 octane gas by mixing 50-50 92 octane with 110octane unleaded racing gas.
Spark timing should not exceed 32deg under boost on pump gas
Start at 28deg.
You'll want to recurve the distributor or use a boost timing retard to limit/retard timing under boost on pump gas.
Blower motors want more inital at idle (20 to 26deg) but less timing while under boost on pump gas (28 to 32deg)
Your stock OEM QJET will go lean under boost unless it is reJetted and the fuel inlet needle and seat replaced. Use edelbrock Qjet tuning parts
big .146" needle and seat (edelbrock #1980). Up the primary jetting about 4 sizes and install rich sec metering rods. "CC" or "CE" are the rich ones.
Install the stiffest pri metering rod step spring from edlebrock #1994
spring set. (yellow 8")
Start with rich jetting.
The stock OEM mechanical fuel pump and fuel lines will not feed this motor enough fuel under boost. Upgrade the fuel pump/fuel lines/filter and in tank pickup tube. Minimum 3/8" fuel line minimum 110 GPH free flow rated fuel pump.
If you starve it for fuel or allow the motor to detonate it will come unglued.

Use colder than stock heat range spark plugs.
If your motor uses a R44TS or R45TS spark plugs switch to a R42T or Champion RV8C
Do not run under boost until you get this stuff sorted out.

A methanol/water injection system will allow more boost and/or spark timing and power on pump gas. Adds a lot of reliablilty to a blown cast piston motor.
www.snowperformance.net
http://www.alcoholinjectionsystems.com/

Last edited by F-BIRD'88; 11-13-2008 at 07:01 PM.
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Old 11-13-2008, 09:47 PM
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Thanks for all the info guys I really appreciate it.

I forgot to add I did install a holley blue fuel pump and new fuel lines as well as hv oil pump et... . I realize running a stock bottom end probably isnt the most reliable setup but this is just a weekend cruiser not a bracket car so I hope it will hold up.

I'm not too sure what stock hp numbers are so I'm really not sure what to expect for a gain. Is a 350-375 hp with just these bolt on's a reasonable goal?

Last edited by cochino12; 11-16-2008 at 05:20 PM.
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Old 11-16-2008, 12:07 PM
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anyone have a guess?
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Old 11-16-2008, 12:53 PM
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Quote:
Originally Posted by T-bucket23
I have a 142 and the difference between the blower and the NA engine was unreal. I destroyed my cast pistons with a litttle to agressive timing curve. What is your current compression ratio. 9:1 is about the max you can have with stock parts or you will blow it up.8:1 is a better starting point.
I too had a 142. I bolted it on a 350 and also noticed a huge difference in power. It seemed like a whole new engine. I had to be careful though because my engine had 9.7:1 compression to start with so I had to mix 114 octane gas to keep it from detonating. I drove it fairly hard for two years like that, with the stock crank and connecting rods.. Unfortunately I sold the truck and who knows what condition it's in now...
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