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Author Topic: Blown VW 36hp project  (Read 5180 times)
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wickedwagens
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« on: June 27, 2012, 12:14:36 AM »

Being a "VW Guy" and falling in love with land speed racing I decided to build a car to run in the 36hp Challenge and get my feet wet racing.  I am building a 68' VW Beetle with a 1500cc 36hp based engine.  Feeding this will be a GMC 3-71.  This will put me in the K36 vintage supercharged category.  Any Ideas will be greatly appreciated.
We started with this.

took it apart, cleaned, and rebuilt the blower.

Here is what we are working with.
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1968 Volkswagen Karmann Ghia
G/CFALT  106.643 MPH  8/2016
G/CGALT  113.131 MPH  9/2016
G/CBGALT  134.606  MPH  8/2017
G/CBFALT  146.715  MPH  8/2017
G/CBGC  158.242  MPH  9/2017
DND
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« Reply #1 on: June 27, 2012, 01:38:14 AM »

Hi Wicked

Since it looks like you are just getting started, could you use a smaller blower that would take less HP to run.

Just a thought'

Don
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Rex Schimmer
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« Reply #2 on: June 27, 2012, 02:15:08 PM »

That blower is bigger than your engine!!! If you run it in a bug where the heck are you going to mount it and how the heck are you going to drive it?? Looking at the belt pulleys that you had it looks like a 4 or 5 to 1 underdrive ratio??? I agree with Don you might want to start with a smaller blower.

Keep it coming as what you are doing is really interesting and you will get plenty of "kibitzing" advice from us in the peanut gallery!!

Rex
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Rex

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panic
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« Reply #3 on: June 27, 2012, 04:10:48 PM »

X3 - even if you need that much CFM, the 3-71 has a higher parasitic load than (example) an Eaton M62, much heavier, higher discharge temperature, physically larger package. The M62 is pretty cheap, used from GM 3800 V6 on eBay.
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manta22
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« Reply #4 on: June 27, 2012, 05:15:19 PM »

More from the peanut gallery--

Sell the 3-71 and use that money to buy an Eaton as Panic suggested. It may not impress onlookers at car shows as much but you'll go faster!

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
wickedwagens
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« Reply #5 on: June 27, 2012, 06:29:32 PM »

What would be a good supercharger that is pre 1965 and will put out +20 psi?  I looked at some other early superchargers and they are low pressure superchargers. 

Dick Landy has a kit for the later model VW's that uses a 4-71 and they work out alright.
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1968 Volkswagen Karmann Ghia
G/CFALT  106.643 MPH  8/2016
G/CGALT  113.131 MPH  9/2016
G/CBGALT  134.606  MPH  8/2017
G/CBFALT  146.715  MPH  8/2017
G/CBGC  158.242  MPH  9/2017
redhotracing
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« Reply #6 on: June 27, 2012, 06:56:47 PM »

Can you run a turbo in that class? Blow through an A2W intercooler into a carb box?
It would definitely kill the problem of parasitic loss, and with that motor you could
use a small, self contained unit without having to mess with oil lines or external
wastegates.

If not, I'll agree with the other guys- an Eaton or other S/C with a smaller ratio;
you may gain HP with the 3-71, but you're losing a large amount in driving it. A
more efficient unit won't look as cool, but going faster is cool, too  cheers
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Luke- Winston Salem, NC
Loring 2 Club- 201.252 (2010)
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wickedwagens
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« Reply #7 on: June 27, 2012, 11:06:28 PM »

No turbos allowed in the class.  Believe me, that it the way I would rather go.  We didn't like not being able to change pulleys so we took a small block chevy blower crank hub and adapted it to fit the vw crank.

Now we can swap pulleys around easier.

The plan is to run a shaft back over the transaxle and set the blower on the back side of the fan shroud.
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1968 Volkswagen Karmann Ghia
G/CFALT  106.643 MPH  8/2016
G/CGALT  113.131 MPH  9/2016
G/CBGALT  134.606  MPH  8/2017
G/CBFALT  146.715  MPH  8/2017
G/CBGC  158.242  MPH  9/2017
El Wayno
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« Reply #8 on: June 28, 2012, 01:02:05 AM »

I think some early Shelby mustangs came with Paxton Centrifugal superchargers. Not sure on the year but should be close. Less parasitic loss in the centrifugal ones, built more similar to a turbo. The one you got looks awsome though. cheers
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Rex Schimmer
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« Reply #9 on: June 28, 2012, 10:54:32 AM »

Can't wait to see how you bolt all of this together!

Rex
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DND
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« Reply #10 on: June 28, 2012, 11:14:54 AM »

Hi Wicked

How much power do you plan on making with your blown V Dub, as talked about a vane blower might get you more bolt on power and that is a good thing.

These rotor types of blowers take a bunch of power to turn them, and with small cube's you do not wan't to give that away that is why bolt on power is something you should look at very close.

Don
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wickedwagens
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« Reply #11 on: June 28, 2012, 06:23:40 PM »

I was under the impression that most of these vane style superchargers are not up to the task of high boost applications.  Which superchargers could be used in my application?  Pre 1965 and +20 psi boost??

Thanks,
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1968 Volkswagen Karmann Ghia
G/CFALT  106.643 MPH  8/2016
G/CGALT  113.131 MPH  9/2016
G/CBGALT  134.606  MPH  8/2017
G/CBFALT  146.715  MPH  8/2017
G/CBGC  158.242  MPH  9/2017
redhotracing
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« Reply #12 on: June 28, 2012, 06:57:37 PM »

You say pre-1965, and no turbos; is the rule specifically against turbos,
post-1965 or both? If it's only pre-'65, an old turbo could surely be pulled
from the nautical or aviation industry. If not, I'd agree that a centrifugal
would be a better choice... Even if it can't make 20+psi, the difference in
parasitic loss may make up for that, plus add the benefits of reduced heat
soak and allowing use of a good A2W intercooler.
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Luke- Winston Salem, NC
Loring 2 Club- 201.252 (2010)
Ohio 2 Club- 203.712 (2013)
saltwheels262
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« Reply #13 on: June 28, 2012, 07:07:11 PM »

I would tend to listen to the guys--

been there, done that and have loads of experience.
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bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events -- made a 2 state change in ZIP codes

" it's not as easy as it looks. "
                            - franey  8/2007
manta22
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« Reply #14 on: June 28, 2012, 07:44:47 PM »

The Corvair Spyder ran a TRW turbo before '65.
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Regards, Neil  Tucson, AZ
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