40hp big bore with alternative supercharger options

n8murphy

i don't know of anything that wont get to hot or fit correctly does anyone else? the vehicle its in is pretty heavy and some torque would be nice.

John Moxon · Posted: Sun Jul 12, 2009 11:09 am Post subject:

Search this forum for "Pepco" and/or "Shorrock."
_________________
John.
Judson Supercharger Information on The Samba
My 1958 Shorrock Supercharged Karmann Ghia
Stop dead photo links! Post your photos to The Samba Gallery!

Shorrock · Samba Member Joined: January 02, 2005 Posts: 433

A Pepco won't provide much if any boost on a 40hp big bore kit. Vintage wise the Shorrock kit is perfect but rare, very expensive and usually requires a rebuild. There are some guys putting modern superchargers on. Do a supercharger search and be patient it is out there.

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

Why not a Judson? I have a big bore and a Judson and it works very well

William

grueni · Posted: Wed Jul 15, 2009 1:05 pm Post subject:

sure will it work well...but the engine will be the same without judson Wink

a 1385cc engine will suck the same like a judson will blow.
did you boost gauge it? there you should see that the judson will make no usefull boost.

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

I'll check the boost gauge but I tought that the torque is still highter with judson + big bore than big bore alone

grueni · Posted: Wed Jul 15, 2009 1:20 pm Post subject:

i will not bet on it.
maybee i bit at lower rpm, but don't forgett the blower needs 15-20% of the engines power to be driven.
i hope you push something over 3PSI everything less is not usefull with that blower and btw this is not much too.

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

Tx I'll check as soon as my car arrive

To make a long story short, I'm french, I leave in the US now and my beetle should be on the boat from Le Havre to New York as we speak Smile

William
www.oldspeed.net

grueni · Posted: Wed Jul 15, 2009 1:39 pm Post subject:

oh,... I hope everything arrive well.

beautiful webpage. is that your engine? is that a judson for a 1200?

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

yes it's my engine. It's the correct Judson for my 65 1200 34HP (40 Us) engine

I miss my car Smile

Only bad thing is that all the major vw events are either in California or Florida

grueni · Posted: Wed Jul 15, 2009 2:37 pm Post subject:

I would miss it too. nice build.
btw:
50cv+ 10cv for the big bore is a wrong calculation with blower, because the blower doesn't suck more without changingt the pulley.

chris.

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

something is weird because in the latest Judson documentation (71 or 72) they say that you can use a the judson on a 1500 and a 1600CC engine

Image may have been reduced in size. Click image to view fullscreen.

William
www.oldspeed.net

Towel Rail · Posted: Thu Jul 16, 2009 3:10 pm Post subject:

Wow, a ~47% increase in horsepower? That's pretty impressive. Would my '67 be too late of a car to run one of these with any credibility? Laughing

- Scott
_________________
1974 Thing -- under the knife
1967 Beetle -- spring/summer/fall driver
1996 Subaru OBW (EJ22, 5-speed, AWD) -- winter car, 3-seasons "don't feel like biking today" car

049 > 070 > 053 > 009

grueni · Posted: Thu Jul 16, 2009 11:33 pm Post subject:

I think that are the jusons for 1600 that I mean....if you have one of those than is your 60HP right.
47% is very optimistic, but with the larger carb it alows more air come into the supercharger.
so if you only have very low boost with your big bore you could open the intake of the judson and put a 34 carb on it that will be make more air and so more boost. maybe than also the 1200 judson will be able to work on your big bore.

hmm 47% more power is alot with 3-6 PSI
I think I have about 90-100% with 14psi on my 36HP engine.
we will see during the next weeks on the dyno
Twisted Evil

John Moxon · Posted: Fri Jul 17, 2009 12:26 am Post subject:

I have always been at a loss to see how overdriving a Judson for the 1500 & 1600 could ever have been achievable.

I'm also well aware of the Judson brochure page reproduced above and it's contents but it pretends overdriving the unit to be a simple procedure...it's not. The extra heat generated by the process has nowhere to go.

Fitting the larger 34pict carb (stock carb on a 1600) wasn't an option on the Judson as the stud spacing is too wide so the largest available carb was the 30pict.
_________________
John.
Judson Supercharger Information on The Samba
My 1958 Shorrock Supercharged Karmann Ghia
Stop dead photo links! Post your photos to The Samba Gallery!

grueni · Posted: Fri Jul 17, 2009 2:44 am Post subject:

not to wide when you build an adapt-peace Wink

so the 1500-1600 kit is a oderdriven judson for 1200??? or am I wronk?

John Moxon · Posted: Fri Jul 17, 2009 3:04 am Post subject:

grueni · Posted: Fri Jul 17, 2009 5:30 am Post subject:

good to know with the pulley. 1.3:1 for 1500-1600 and what is the ratio for stock 1200?would be interesting for me.
but to adapt an other carb is for sure not easy, but pussible. 28mm carb or 20,5-21,5mm venturies are very small to feet the supercharger.
judson is a very nice supercharger. only the heating problem sucks.

xilly · Samba Member Joined: May 19, 2005 Posts: 171 Location: USA

the only way to know if the Judson is effective on 1400+ engine will be to dyno it with and without the Judson

Someone did it allready?

William
www.oldspeed.net

John Moxon · Posted: Fri Jul 17, 2009 9:12 am Post subject:


Hello! Log in or Register \| Help \| Donate \| Buy Shirts	See all banner ads \| Advertise on TheSamba.com

40hp big bore with alternative supercharger options
Page: 1, 2 Next

	Forum Index -> Vintage Speed	All times are Mountain Standard Time/Pacific Daylight Savings Time Page: 1, 2 Next
Page 1 of 2