Weiand Blower Question
 

??

Just a question............what are the differences between a weiand street blower, and the marine blower.

Asking because I was wondering what would happen if you put a 177 street blower on a marine engine (they don't make a 177 marine blower for a SBC)

Would it survive ?

Ideally, this would be intercooled (maybe not the first year) and spin about 6000-6500 rpms,

Any input is appreciated.

6500 rpm's is really beyond the 177's range of efficiency. Perhaps a 250 would better serve you. I think the differences between the street and marine are the relief (pop-off) valves.

I am no expert for sure but I do have opionions. :D Street blower and Marine I believe GO4BROKE is correct. Really just depends on what your goal is. I could go on but really need more info. Would the blower survive I would say yes. How long is another question that has a lot of variables that need looked at. Motor life, well need more info.

What do you mean they dont make a 177 for marine SBC

I had one on a Merc 300 tempesr SBC and it made 433 HP@5200 rpm's with 5 lb's boost in a 1986 Formula 223LS

I was looking through a catalog, and all I saw was a 142 marine style blower, and a 177 for a big block, and a 177 street blower for a small block..........or did i miss something

Are you sure you didn't have a 142 ?

Right now, I have 355's that make about 425-440 hp at 6000.

I spin a 21 P props around 6000, and the engines move a 7500 plus pound 31 scarab to 71. anyways, i was considering doing a set of 383 short blocks & blowers (that way, I could use everything else I have).

I think I read somewhere that the marine blowers are hard anodized on the inside for corrosion protection. No other differences. It should work fine for a while. Or call a distributer and see if there's anything they can do for you.

Also someone probably makes a 6-71 set up for a small block

You would be better to look for a larger blower than a 177 and turn it slower.A 177 is going to build alot of heat @ 6000-6500 rpm.
The difference ... ??? The marine blower kit included special adapter for the thermostat housing for the 174 B&M .This was needed for clearance around the drive snout . They also included all the pulleys and spacers to achieve alignment for your accessories. The term (marine) tends to add $$$ to the price as we already know.:)

I really like this link!

http://www.gearheadracing.com/Refere...dtheBasics.htm

If i remember correctly, B&M along with weiand (now holley) use 177, 250 and 420 model numbers, and these model numbers mean how many cu. in. of air the blower moves per revolution. Since the question is about a 350 in. small block, seems as though the 177 would turn about 2 to 1 for zero boost. What would be the difference in using a 250 blower on a 502 in. motor? I used to run a 177 on a 502 and got many hours of service. It had great power, and made ton's of noise. I have seen several small blocks with 177/142's that looked great and ran well too. Good luck!
Steve

The Merc 525SC came with the Weiand 177. B&M's counterpart is the 174. Holley acquired B&M and Weiand. They still use the Weiand name but use the Holley name in place of the B&M designation.

I was thinking that the 525sc came with a weiand 256... Maybe i am mistaken.
Steve

According the the Mercruiser Shop Manuals (good reading! Buy them) the 525SC has an Weiand 177 blower running at around 5-5,5 psi on the 454 making 525hp.

The 2003 Mercruiser Racing HP575SCI has an Holley 256 blower running at around 5-5,5 psi on an 502 making 575hp at 5200rpm.

Ratchet - The 177 Blower should work very well in your application. You are correct Weiand did not offer a Marine 177 for SBC only 142. The difference from street to Marine would be crank spacing and Thermostat adapter.

Good Luck

a 142 Weiand or 144 holley would produce sufficiant boost for a small block with single carb app. I do
recommend an aftercooler and oil cooler if you plan to run the engine hard though. Blowers produce alot
of heat and stock coolers just don't do the trick. But
if you are looking for longevity out of this engine, I
would try to keep the peak cam range in the low to
mid 5000 rpm range and go with a bigger prop.
Blowers tend to help engines fly apart at high rpms.
As far as 383's go......some people swear by them...
others like myself believe they are not well balanced
engines and do not tolerate the constant higher rpms
of the marine world. Probably why mercruiser destroked
a 400 to make the 377 :) ...Anyway thats just an
opinion. If your 355's are set up right, it would not
be unheard of to reach 500hp with aftercooled "intercooled" blowers. Goodluck to you.

TO: 29scarab....yea they are noisey aren't they :)

what did u get for speed and what did you all do to the motor ?

Engine rpm has little to do with the actual blower rpm. You just need to size the pulleys correctly. Max blower rpm for a 177 is 13500 rpms. At 100% over driven you could spin the engine to 6500rpms. Stock 525sc was 100% over driven and made 5.5# boost on 454 ci. On a 350 the same ratio would make around 8# of boost.

I ran a street 177 blower for 13 years with zero issues on a marine 454. Great setup for stock or mild engines.