8-71 10-71 12-71 blower?

[wsuwrhr]

Just asking outloud here.

Say you wanted to make 8-10 psi max on a sub 500inch with a chiller, for adiabatic efficiency, I think it would be better to spin a bigger blower slower than spin a smaller blower faster.

I know turbos and EFI are the way to go, but way more complex install and doesn't have the oldchool cool look of a supercharger and carburetors.

What say ye?

Brian

 

[Runs2rch]

Here you go!

https://whipplesuperchargers.com/index.php?dispatch=products.view&product_id=244

 

[nuckingfuts]

Anything with a blower is cool even a Ford.

 

[wsuwrhr]

Anything with a blower is cool even a Ford.

Since we don't have any fords, we are good there.

 

[4Waters]

What are you to good for a 14-71?

 

[wsuwrhr]

What are you to good for a 14-71?

Too.

Cause it is way overkill. Plus it gets in the way of the distributor on a Chevy. On a Mopar, heeeellllllyes, not so much.

Prolly could make that boost with an 8, but spinning it hard, thinkin spinning the 10 slower would work. Just picking peeps brains.

Brian

 

[4Waters]

Way overkill. Plus it gets in the way of the distributor on a Chevy. On a Mopar, heeeellllllyes, not so much.

Prolly could make that boost with an 8, but spinning it hard, thinkin spinning the 10 slower would work. Just picking peeps brains.

Brian

Shut your mouth "overkill" that's what they said to Ronnie Barrett when he said I want to make a shoulder fired 50cal, no such thing when it comes to guns, horsepower, smokers etc.... you know guy stuff.

 

[02HoWaRd26]

PSI or stay home

 

[wsuwrhr]

Not looking for a max effort race engine here.

Down!!!

Shut your mouth "overkill" that's what they said to Ronnie Barrett when he said I want to make a shoulder fired 50cal, no such thing when it comes to guns, horsepower, smokers etc.... you know guy stuff.

 

[wsuwrhr]

Good grief.

You guys are killing me over here.

PSI or stay home

Not looking for a max effort race engine here.

Down!!!

 

[wsuwrhr]

PSI or stay home

30-60 psi, Noted.

 

[1homeblown]

I like the idea of the 10-71 being the biggest you can run without using an offset for the ignition.


Sent from my iPhone using Tapatalk

 

[Runs2rch]

Run this one then. Twin screw is leaps and bounds better all around that old roots technology.

https://whipplesuperchargers.com/index.php?dispatch=products.view&product_id=49

 

[02HoWaRd26]

30-60 psi, Noted.

Oh i thought you were going bbc not duramax lol.

This day in age I’m amazed so many are still building with Roots style blowers vs the twin screw Whipple’s etc. a 4.5L will give all you need or want and still FI

 

[4Waters]

Not looking for a max effort race engine here.

Down!!!

For what you want to do I think a 10-71 would do fine.

 

[Runs2rch]

Oh i thought you were going bbc not duramax lol.

This day in age I’m amazed so many are still building with Roots style blowers vs the twin screw Whipple’s etc. a 4.5L will give all you need or want and still FI

Carb twin screw still better. Reliable, cooler running, more hp/tq pound for pound of boost.

 

[mjc]

Roots blowers all take a lot of HP to run, not sure how muich more it takes as they get bigger.

 

[Runs2rch]

Roots blowers all take a lot of HP to run, not sure how muich more it takes as they get bigger.

Exactly. 100-200 hp parasitic loss is normal for a 1071/1271.

 

[HighVoltage329]

With an intercooler you don't need an offset distributer to run a big blower.

 

[mash on it]

Roots blowers all take a lot of HP to run, not sure how muich more it takes as they get bigger.

But he'll be turning it slower, so less parasitic loss?

Dan'l

 

[02HoWaRd26]

BoostPower just called and said man up already...........

 

[wsuwrhr]

Whipples are nowhere near old school cool.

Oh i thought you were going bbc not duramax lol.

This day in age I’m amazed so many are still building with Roots style blowers vs the twin screw Whipple’s etc. a 4.5L will give all you need or want and still FI

 

[wsuwrhr]

Overkill for what is mentioned. Seems like an echo in here.

BoostPower just called and said man up already........... View attachment 646767

 

[wsuwrhr]

I thought only the 14 needed an offset. Good to know.

I like the idea of the 10-71 being the biggest you can run without using an offset for the ignition.

 

[1homeblown]

I thought only the 14 needed an offset. Good to know.

I’ve never had a 12-71 in my possession but my 10-71 cleared the distributor on my old BBC. I don’t have any resources to quote but I’m pretty sure the 12-71 is too big as well as the 14-71.




Sent from my iPhone using Tapatalk

 

[wsuwrhr]

If you aren't looking for 30-60 psi, then a PSI is waaaaay overkill for that deal.

Oh i thought you were going bbc not duramax lol.

 

[wsuwrhr]

Yes sir, the 14 hangs off a good ways.

So it sounds like a nicely driven 10 it is.

I’ve never had a 12-71 in my possession but my 10-71 cleared the distributor on my old BBC. I don’t have any resources to quote but I’m pretty sure the 12-71 is too big as well as the 14-71.

 

[Rajobigguy]

One of the problems that you run into when running a roots type blower is low speed blower surge, that is particularly true when using a large displacement blower. If this is for a street application you would be much better off using a twin screw blower like a Whipple because they deliver more linear flow. I doesn't hurt to upsize the blower a little and turn it @ a lower speed but it does eat a little more HP turning the additional mass.

 

[Runs2rch]

Whipples are nowhere near old school cool.

Yes but, you have a family cruiser. Not a drag boat. The whipple gives you everything. Why listen to ridiculous blower whine, and deal with surge around the dock? Whipples sound bitchin without be annoying, and they flat out perform.

 

[LargeOrangeFont]

Yes sir, the 14 hangs off a good ways.

So it sounds like a nicely driven 10 it is.

Welcome back to yesterday evening

 

[Runs2rch]

Welcome back to yesterday evening

So you mean last night?

 

[wsuwrhr]

Come on now, was anything decided?

Welcome back to yesterday evening

 

[wsuwrhr]

So, blower surge is listed as a problem? Noted.

One of the problems that you run into when running a roots type blower is low speed blower surge, that is particularly true when using a large displacement blower. If this is for a street application you would be much better off using a twin screw blower like a Whipple because they deliver more linear flow. I doesn't hurt to upsize the blower a little and turn it @ a lower speed but it does eat a little more HP turning the additional mass.

 

[4Waters]

Yes sir, the 14 hangs off a good ways.

So it sounds like a nicely driven 10 it is.

That's what she said.

 

[wsuwrhr]

That's what she said.

Noted.

What was her tone when she said it?

 

[was thatguy]

Noted.

What was her tone when she said it?

Surging.

 

[4Waters]

Noted.

What was her tone when she said it?

Scared

 

[wsuwrhr]

Surging.

Nice tone.

 

[wsuwrhr]

Scared

Don't be scared.

 

[was thatguy]

Nice tone.

Sounds like your choice is either the 10 or the 12.

 

[Runs2rch]

So, blower surge is listed as a problem? Noted.

On a family boat I would say yes. When you do any watersports with your family it won't be so great.

Is blower surge cool. Yes. No disagreement there.

 

[wsuwrhr]

12 prolly too big. Don't want clearance "prolems" or a hidden distributor.

Sounds like your choice is either the 10 or the 12.

 

[rvrrun]

So, blower surge is listed as a problem? Noted.

That's the whole point a blower.

 

[4Waters]

Yes but, you have a family cruiser. Not a drag boat. The whipple gives you everything. Why listen to ridiculous blower whine, and deal with surge around the dock? Whipples sound bitchin without be annoying, and they flat out perform.

Some of the whine is the air escaping from the belt/cog mesh you can use different belts to reduce it or keep the belt a little looser and if you know a machinist you could drill small holes in the cog, a friend did it and it made a difference in the amount of whine.

 

[wsuwrhr]

That's the whole point a blower.

Id like to think so. That is the motor letting everyone know, "Im here to party"

 

[rvrrun]

Id like to think so. That is the motor letting everyone know, "Im here to party"

My wife gets excited every time she hears that in the channel.

 

[wsuwrhr]

Yessir, some of the whine is from the air escaping the gilmer cog. The radius belts are quieter then the trapezoid for sure. Since less air gets trapped.

I have done it in the past, and I have always tried to talk peeps out of it.

Some of the whine is the air escaping from the belt/cog mesh you can use different belts to reduce it or keep the belt a little looser and if you know a machinist you could drill small holes in the cog, a friend did it and it made a difference in the amount of whine.

 

[wsuwrhr]

Side bene.

My wife gets excited every time she hears that in the channel.

 

[4Waters]

Yessir, some of the whine is from the air escaping the gilmer cog.

I have done it in the past, and I have always tried to talk peeps out of it.

Why?

 

[wsuwrhr]

Why?

Why the noise or why did I do it?

I would imagine the noise is the air is being squeezed out of the space.

Why I did it is because I got paid to do it.

I drilled one once in my former life too. Maintenance was trying to figure out how to make a machine quieter that had a gilmer belt, I told them to take off the pulleys and I would fix it. Fuckers didn't believe me. They did when I was done. "Pretty good for a kid, ey?" I read a lot of engine/motorsports books when I was in school.