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Old 05-30-2009, 11:20 AM
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weiand 177 vs 250

I was just a few clicks away from ordering a weiand 177 blower then I saw that the weiand 250 actually is lower than the 177 according to weiand/holleys homepage, am I missing something? I thought it would be taller than the 177. I cant go to high through my hood but would like something more powerfull than the 142

Is the 250 as good as the 177 except its bigger, will it still be useable on a street driven SBC?

As I understand it has teflon tipped rotors, does those require maintenance more often?
(Im located in europe => service may be a problem)

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Old 05-30-2009, 03:23 PM
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The 250 has a longer case, so it requires the use of a small diameter distributor, you can't use an HEI. It also requires the use of two carbs instead of one.

Both blowers you are considering have teflon tipped rotors IIRC.
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Old 05-30-2009, 05:25 PM
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The reason the 177 sits a little higher is it sits on a uncompromised intake manifold with a higher blower mounting pad height.
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Old 05-30-2009, 05:47 PM
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Quote:
Originally Posted by F-BIRD'88
The reason the 177 sits a little higher is it sits on a uncompromised intake manifold with a higher blower mounting pad height.
uncompromised in which regard? Does the higher mounting pad give the 177 an advantage?

Last edited by Roald; 05-30-2009 at 06:03 PM.
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Old 05-30-2009, 06:55 PM
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250 blower

While I have not used a 177, I have used both a 142 and a 250 Weiand/Holley on a SBC. While the 250 can be outfitted with a single carb plate, engine dyno runs on my engine and "on the street" experience quickly established that two 4s are essential with the 250. The longer, and lower, blower case on the 250 causes the forward cylinders (1 and 2) to run much too lean with a single carb. In terms of "swept volume", the 250 closely resembles a 4:71 Jimmy blower. There is, by the way, an older excellent thread in which legendary street rodder Jim Davis ( who worked at B & M when it was making the 142/250 blowers) comments on the 250. If you search using "swept volume 4:71" you should be able to tap into this very useful thread. Davis, and I, strongly favor the 250, so long as you run two carbs.
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Old 05-31-2009, 03:35 PM
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Quote:
Originally Posted by 471A
While I have not used a 177, I have used both a 142 and a 250 Weiand/Holley on a SBC. While the 250 can be outfitted with a single carb plate, engine dyno runs on my engine and "on the street" experience quickly established that two 4s are essential with the 250. The longer, and lower, blower case on the 250 causes the forward cylinders (1 and 2) to run much too lean with a single carb. In terms of "swept volume", the 250 closely resembles a 4:71 Jimmy blower. There is, by the way, an older excellent thread in which legendary street rodder Jim Davis ( who worked at B & M when it was making the 142/250 blowers) comments on the 250. If you search using "swept volume 4:71" you should be able to tap into this very useful thread. Davis, and I, strongly favor the 250, so long as you run two carbs.
Thanks, I found the old thread - great information

I dont mind using two carbs and a smallbase distributor, two 600 holleys should be enough for a SBC?

Theoretically, if I turn the 250 1:1, I should get the same amount of air per engine revolution as if I was turning the 177 1.41:1. But will the rotor leakage on the 250 be too great at this low speed?

My plan was to experiment and learn on a cheap all cast 350 sbc (8.5 CR) and later move up to a 383 built to run boost
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Old 06-01-2009, 09:42 PM
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250 blower

Two 600s is recommended by Holley/Weiand. As for drive ratios, the "standard" pulley ratio on the 250 is 1.33 yielding 8-9 pounds of boost.
A 1.24 upper pulley will yield 6-7 pounds, 1.44 pulley 10-11 pounds,
1.56 pulley 12-13 pounds, and 1.65 pulley 14-15 pounds.
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Old 06-02-2009, 04:59 AM
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Quote:
Originally Posted by 471A
Two 600s is recommended by Holley/Weiand. As for drive ratios, the "standard" pulley ratio on the 250 is 1.33 yielding 8-9 pounds of boost.
A 1.24 upper pulley will yield 6-7 pounds, 1.44 pulley 10-11 pounds,
1.56 pulley 12-13 pounds, and 1.65 pulley 14-15 pounds.
Thanks
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Old 06-02-2009, 07:59 AM
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Can one of you guys post a link to that thread or give me a thread number. Search isn't working for me for some reason.
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Old 06-02-2009, 08:11 AM
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Quote:
Originally Posted by XNTRCI-T
Can one of you guys post a link to that thread or give me a thread number. Search isn't working for me for some reason.
Yep, here it is

4-71 Blower Many many questions and opinions needed HELP!! please!!!
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Old 06-02-2009, 08:20 AM
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Thanks, Roald!!
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Old 06-02-2009, 01:59 PM
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Quote:
Originally Posted by ericnova72
Both blowers you are considering have teflon tipped rotors IIRC.
Are you sure its not the 174 that is teflon tipped? I cant find anything about the 177 being teflon tipped.

Anyway, will a teflon tipped (street)blower require maintenance sooner than a non-teflon tipped blower?
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