sbc with a 177 blower

**jayman54** · 10-11-2006 08:15 PM

ok heres my plan and hopefully i can get some input and some advise...i want to build a blower motor for my 1956 pontiac...i'm currently running a sbc that works alright with truck stock dished piston and double bump heads milled down to 60cc and a decent cam, headers,5speed etc...
its a four bolt main block and is standard bore...
i want to run a weiand 177 roots style blower and have done alot of reading and can get one for a good deal through my work and still give me some room to play if i wanna make more hp... i want to run it on the 350 with the stock pulley setup to start with which will run 7.4 lbs of boost...i've been thinking about goin with aluminum heads to give me a little more of a safety zone and help out with compression issues and better flow..i will have to drop my compression down to 8.5 to make it work well so i've been told and have read from holley...i was wondering what i should be looking for for pistons and combustion sizes and weather i should have the block decked...now i'm just looking into cams and am not sure yet what to be looking for for duration or lift....according to holley i shouldnt have much problem making 400hp+ if this setup is done right... so if anyone can throw some advise my way i would greatly appreciate it thanx...

**jayman54** · 10-11-2006 08:29 PM

i've always loved the sound of a blower wine when u get into it and the idle of a well tuned blower motor reving up and down all the time plus the hp

**techinspector1** · 10-11-2006 08:50 PM

Jay, you are aware that it is the teeth on the Gilmer belt hitting against the faces of the pulleys that make the whine, right?? If the smaller blower uses conventional belts, it will be pretty quiet.

Adjust the c.r. with either piston volume or combustion chamber volume according to these instructions.....
http://www.streetmachinesoftablerock...opic.php?t=124

Read all the tech info here to choose the proper cam. Click "tech info" at the top of the page.......
http://www.blowerdriveservice.com/

Adjust the deck height and gasket to achieve 0.035" to 0.040" squish to keep detonation under control. Also look into some of the water injection systems that are available.

You'll notice that Blower Drive Service suggests no more than 6 lbs of boost at 8.5 to 9.0 c.r.

**camaro_fever68** · 10-11-2006 09:12 PM

The 177 on a 350 will make good power. My suggestion is to find a reverse dome/D-shaped dome piston in the 8.5-9.0 CR range. Use some good aluminum 64cc chamber heads with 180-200cc runners. Use a nitrous/blower grind type cam in the 236 degree@.050 range. Run a tight quench area to stop detonation and it will be one tuff combo.

**erik erikson** · 10-12-2006 06:57 AM

Originally Posted by jayman54

ok heres my plan and hopefully i can get some input and some advise...i want to build a blower motor for my 1956 pontiac...i'm currently running a sbc that works alright with truck stock dished piston and double bump heads milled down to 60cc and a decent cam, headers,5speed etc...
its a four bolt main block and is standard bore...
i want to run a weiand 177 roots style blower and have done alot of reading and can get one for a good deal through my work and still give me some room to play if i wanna make more hp... i want to run it on the 350 with the stock pulley setup to start with which will run 7.4 lbs of boost...i've been thinking about goin with aluminum heads to give me a little more of a safety zone and help out with compression issues and better flow..i will have to drop my compression down to 8.5 to make it work well so i've been told and have read from holley...i was wondering what i should be looking for for pistons and combustion sizes and weather i should have the block decked...now i'm just looking into cams and am not sure yet what to be looking for for duration or lift....according to holley i shouldnt have much problem making 400hp+ if this setup is done right... so if anyone can throw some advise my way i would greatly appreciate it thanx...

The 177 blower will work but the belt set up makes me nervous.
I would save your money and buy a 6-71 for a few hundred more.
Piston's like the Speed-Pro reverse dome will work fine.
Depending on who you talk to they will say either 110 or 112 l/s for the cam either on will work for what you are doing.
I would look at cams that have a duration of 225 to 235 at .050.
I would also have at least 6 degree's min. more of exhaust duration.
The aluminum heads will help some with the detentation issue.
At 500 or more hp I would start to look at 4340 cranks and very good h-beam rods.
At 450 or under the 1053 steel crank will work but I would buy some good i-beam rods to go with it.
Buy good head gaskets the $20 a set ones won't cut the mustard.
I would run the Cometic head gaskets.
Yes,I know they are pricey,but they are about bullet proof.
If you decide to go with the 6-71 make sure you have to key-ways cut in the crank snout.
Run a good balancer with the two-key ways.

**jayman54** · 10-12-2006 07:01 PM

i was looking at the 6-71 setup and just cant afford that setup....

**jayman54** · 10-12-2006 08:12 PM

trying to do this on somewhat of a budget....i'm only 23 and work at napa and i'm trying to get the bang for the buck.... i'n not new to engines or hot rods its been my life i just want to build a blown motor for the experience and for the fun of driving it... ohyea tech when i ment the whine i ment when ur accelerating hard they really wine i herd a 142 blower and it sounded cool but at idle u woulndt know it was there except for the wild sounding idle... u'd think it was just gonna stall the it'd rev up and just keep doing it not missing a beat....sounded very snappy

**viking** · 10-12-2006 08:23 PM

Also gapless rings with any forced induction is a good idea.

**gassersrule_196** · 10-12-2006 10:25 PM

ive seen guys punch small holes in between the teeth with a small drill bit to let the air out quites them right down. funny how that tidbit is often overlooked

learned it when i was like 6

[QUOTE=techinspector1]Jay, you are aware that it is the teeth on the Gilmer belt hitting against the faces of the pulleys that make the whine, right?? QUOTE]

**erik erikson** · 10-13-2006 03:24 AM

[QUOTE=gassersrule_196]

ive seen guys punch small holes in between the teeth with a small drill bit to let the air out quites them right down. funny how that tidbit is often overlooked

learned it when i was like 6

Originally Posted by techinspector1

Jay, you are aware that it is the teeth on the Gilmer belt hitting against the faces of the pulleys that make the whine, right?? QUOTE]

Holes in a blower belt??Oh,my.

**shawnlee28** · 10-13-2006 07:30 AM

[QUOTE=erik erikson]

Originally Posted by gassersrule_196

ive seen guys punch small holes in between the teeth with a small drill bit to let the air out quites them right down. funny how that tidbit is often overlooked

learned it when i was like 6

Holes in a blower belt??Oh,my.

Then the old fish net lookin belts would have made you faint

**camaro_fever68** · 10-13-2006 08:18 AM

No one drills the belt. The pulley can have a small hole between each cog that allows the trapped air to escape. Same for gear to gear timing sets. Some like the whine and some don't.

**gassersrule_196** · 10-13-2006 12:54 PM

Holes in a blower belt??Oh,my.[/QUOTE]

the pulley not the belt jeeez........................

**viking** · 10-13-2006 01:44 PM

Hmmmmmmmmmmmm

**R Pope** · 10-13-2006 03:56 PM

It ain't all the belt. Any farmer who ever ran a bin vac knows how a Rootes type blower howls. Even a Potvin drive moans.

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