When to redo blower??

Curious what and when do people do to freshen their blowers other than new stripping.

If the blower still makes boost do you just keep running it? ie made 36 lbs of boost all year and never fell off.

Do you send back to manufacturer of the blower or is their a go to guy who most use that does very nice general work without getting pricing out of control?

What options, if any, are there for improving a blower.

any thoughts and opinions welcome. thanks

 

I was always told to that if you backfired it or knocked the burst panel out of it , you need to get it restripped. But if you have a good fuel system and lube your blower daily you should be good to go for a while.

 

As mike says, depends on what type of racing your doing, and what you want to accomplish, if you have a monitoring system on boost and it’s the same at the hit and on the big end and your happy with performance, why restrip it?, on the other hand, if it’s been awhile since being looked at, sometimes we can see a problem developing before it gets expensive, a std restrip with seals and everything from us at Littlefield’s is usually $400, now if I see a problem that would cost you more, we will call you and discuss what it may need, any help I can give you feel free to call me.

 

Good info - never backfired or blew out the burst panel and the blower has not moved as far as boost all year. Maybe a few lbs over the entire year but that would be picking up a lb or so in very good air??

And yes its mostly a dial in car so every inch of performance is not needed. I have seen people have their blowers redone and pick up huge - I assume they were pretty wore out?

will weigh all options and try to learn more about all aspects as this is the first year running a blown motor.

thanks for the replies

 

Are you sure about 100-180 HP/psi?

Once on the dyno we upped the OD by 25%, went from 18 to 27 psi and picked up 150 HP at the flywheel. That's about 17 HP/psi

 

Boost isn’t always power if it creates more heat and the overdrive makes the blower less efficient, there’s a lot to be said for openings and overdrive besides other factors in today’s blowers

 

Yep, we had the tuneup.
Please explain the "design specs of the blower"?
I have blower dyno data on our blowers if that helps

 

To sound like a real dumbass - what is it that really makes one blower so much better than another. Is it the rotor design? not that I expect every answer in the book but what makes one blower that costs 30-35k spun 16 over so much better than a off the shelf that is spun at 30-32 over and makes much less power?

 

Our blowers are designed for 35-45% OD and that's where we run them. If you go to a higher OD they have a different inlet for that.

Mike are you saying if we don't change our OD but make a modification to the blower/hat/intake/heads and the boost changes by 1 psi its 100-180 HP? (please be patient with me I'm just trying to understand)

 

Just a stupid question. You always talk about OD but I think the number to check should be the actual RPM of the blower. 16% OD on a 10k revving engine are quite different from 16 on a 8k revving one. Am I wrong?

 

Its not a stupid question its a great question and absolutely true

 

hello Mike
just bought a whipple screw blower from an alcohol F/C team here in Europe.
i guess they are running much better heads than those on my engine(old BAE fuel heads):
so by using heads with less flow, i should see boost numbers higher than those provided by the seller,but making less power?
are there proven ideal head/blower combinations(at a given OD)?

 

Ok sounds good, if I mod my blower and gain a psi I should expect at least 100 HP gain, got it, thanks