Blowing The Bug

Joel · 2007-10-19T14:33:57+00:00

Hey all well i keep getting flooded with PMs and emails from here, the samba and shoptalk about the blower on my bug so rather than keep answering the same questions to heaps of ppl over and over again i figured i do a write up with pics. id thought about supercharging the bug for ages. Id already tried my hand at turbocharging a while back after a mate gave me the old turbo from his GT starlet when he upgraded. turbos are great but are alot more work and i found lag was very frustrating and high oil temps were being a problem. Once u get a taste for forced induction its like VWs themselves, an addiction that just keeps growing There arent alot of superchargers out there on the market for vws especially in oz. the old judsons and shorrocks are around but they are made for tiny 1200s and are big $$ not to mention very rare ive only recently built the engine in my bug , its a 1776 with a 416C tighe cam, stock heads with mild porting, HD valve springs, full flowed, balanced and a lightened flywheel I built it with mahle P&Cs so it had a CR of 8.8:1, a bit high for force fed but ill deal with that later currently it ran 40mm webers and had more than ample power and economy but the need for more was there......famous last words this conversion had been done b4 and i spoke to Steve Rae first as hes done it in a few styles with good sucess. i really gotta give him a big thanks for all the help he gave me thro out the project and also my good mate Don for the top welding job he did on the blower manifolds I picked up an SC12 blower from a low KM MR2 that had just been imported from japan and unfortunatley was written off soon after the SC12 is the smallest of the toyota blowers and comes off the mk1 supercharged MR2s and corollas/levins and sprinters there is the more common larger capacity SC14 which comes off the bigger 2L toyotas like soarers, chasers and crowns but whilst its almost identical to the sc12s its about 50mm longer and thats just to long to fit a type 1 motor a pancake type 3 or type 4 cam get away with it tho these are very popular with the ecotec commodore guys heres a pic showing the 2 side by side to give an idea on the lenght difference the SC12 displaces 1200cc and the SC14 is 1440cc

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 · 12 May 2012, 8:25 am

#901498

Thanks Joel. I'm running a new thread on a trike forum on superchargers so ahve to get it right so your info is very valuable. Bit like my experience with women ... lol

With the ea81 advanced timing being I think 28 degrees then if it was fixed at say 16 or 20 with no advance at all it would allow me to ride it to a good tune up place for correct timing to be done? I have an electronic dizzy

www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

fast68 Commited Dubber

58 posts · joined Jul 2009 · 16 May 2012, 11:58 am

#902264

Hi Joel or anyone else, any info on running temps, Cylinder head, oil.

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 · 17 May 2012, 6:46 pm

#902529

I've been told that the VE velometric efficiency of a blown engine will determine the accuracy of the psi obtained.

If a VE of an engine is say 80% and your boost gauge indicates 6psi...you could be achieving 9-10psi in real terms.

is this the case?

I've calculated the VE of a ea81 stock to get .79

www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 17 May 2012, 8:51 pm

#902578

Tweety, the watercooled engines are alittle more tolerant to more advance under boost than the old aircooled volksys, you would just have to have a play around see finding how much timing it likes without knocking, but just limiting the advance is alot better than locking it.

Fast68, I saw no changes in oil temp but I'm sure if I had a head temp gauge and nailed it up a big hill I'd see a the head temps creep up abit but nothing worth worrying about.
Before they changed the Pacific highway speed limit on the big St Helena hill at Byron Bay I used to love blasting past all the modern cars at 110km/h up there.
The WTF looks I used to get were priceless.
If it was gonna die that woulda been when and where.

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 · 18 May 2012, 6:54 pm

#902727

Thanks Joel for a priceless thread. Got a lot of info out of it. Havent received my SC12 yet, still in transit. likely sitting in a freight shed in Shepparton.

This thing will sing its head off and I wont hear the misses. bonus....(I've resisted intercoms haha)

Tony

www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

vdubjim Learner Dubber

4 posts · joined Oct 2013 · 16 Mar 2015, 1:48 am

#1009875

cant wait to find one

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 16 Mar 2015, 11:46 am

#1009889

Jeez back from the dead.

I've still got my 1776 engine and Supercharger setup to go in another bug (was hoping to build a Baja) but everytime I get one its either too rusty or sold before I get the chance.

I got another Superbug last year with a dead engine I was going to put it in but another member on here came up from Sydney to buy it before I had the chance.

vdubjim Learner Dubber

4 posts · joined Oct 2013 · 16 Mar 2015, 11:54 am

#1009890

lots of posts on the web with this setup but none as through.
also ran across the joeblow.me site. friend of yours?

humpty Bishop of Volkswagenism

3,336 posts · joined Sep 2002 · 16 Mar 2015, 11:56 am

#1009891

vdubjim wrote:cant wait to find one

Have a chat to Mick Percy in Adelaide (joeblow.me).... He has a kit to make this kit a bolt in.... It uses a DCOE carb I think.... Its very similar to the one that Joel developed all those years ago.

Have you seen Brocks VRod here in Perth Joel?... I helped him (very minor help) develop a more traditional setup on his car... With twin carbs!

FUCH your early!

http://www.noh2o.org/

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 16 Mar 2015, 11:57 am

#1009892

Nope but I'd like to, got a link or pics?

humpty Bishop of Volkswagenism

3,336 posts · joined Sep 2002 · 16 Mar 2015, 12:04 pm

#1009893

FUCH your early!

http://www.noh2o.org/

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 16 Mar 2015, 12:13 pm

#1009897

Now that is awesome.

Just needs one of those old school Bee scoop intakes like some of the old Dick Landy blowers for bugs had.

vdubjim Learner Dubber

4 posts · joined Oct 2013 · 16 Mar 2015, 12:18 pm

#1009899

micks setup is cool, but $950 us for a bracket and pulleys?? nahh im good

humpty Bishop of Volkswagenism

3,336 posts · joined Sep 2002 · 17 Mar 2015, 12:46 am

#1009942

vdubjim wrote:micks setup is cool, but $950 us for a bracket and pulleys?? nahh im good

A bit more too it than that, but im sure you'll come up with a nice setup... Make sure you do a build thread!

FUCH your early!

http://www.noh2o.org/

vdubjim Learner Dubber

4 posts · joined Oct 2013 · 17 Mar 2015, 2:15 pm

#1009952

Reading this post there is??
Note my price, I'm not talking his whole kit..

Speaking of kit.....who was first? Joel or Mick, or they together? I'm curious since your so defensive.

modnrod Fahrvergnugen

978 posts · joined Mar 2011 · 17 Mar 2015, 3:00 pm

#1009953

Joel wrote:Just needs one of those old school Bee scoop intakes ..........

I'm with you Joel!
I like them a lot too.......

😁

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 17 Mar 2015, 8:17 pm

#1009970

Holy crap Dave is that a NOS bottle on that kwaka?

vdubjim wrote:Speaking of kit.....who was first? Joel or Mick, or they together? I'm curious since your so defensive.

Micks kits were a few years after mine but I'm certainly not the first person to stuff an SC12 on a VW engine, probably just the first to document in depth

modnrod Fahrvergnugen

978 posts · joined Mar 2011 · 17 Mar 2015, 9:42 pm

#1009973

Joel wrote:Holy crap Dave is that a NOS bottle on that kwaka?

You'd be amazed how many people believed me when I said it was a fire extinguisher! 😂

That Volksrod over here is just a ripper. I have the hugest respect for the builders Zen-like patience in getting a plate on it over here, truly remarkable.

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 · 20 Mar 2015, 8:34 pm

#1010118

I planted a SC12 on my ea81 Brumby engine on my trike. Now its NA. If you do it, water injection is a waste of time and money. Didnt assist fuel consumption and just added more "stuff" in the engine bay.

For a manifold between the delorto and the Sc I used half of a Datsun 1600 twin carb manifold. worked well in terms of fitment.

And it was all done with Joel's help too

Humpty, that beetle looks great.

Tony

www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

humpty Bishop of Volkswagenism

3,336 posts · joined Sep 2002 · 24 Mar 2015, 3:57 pm

#1010316

modnrod wrote:
Joel wrote:Just needs one of those old school Bee scoop intakes ..........
I'm with you Joel!
I like them a lot too.......

😁

Mad man!

FUCH your early!

http://www.noh2o.org/

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 · 24 Mar 2015, 6:51 pm

#1010322

tweety wrote:I planted a SC12 on my ea81 Brumby engine on my trike. Now its NA. If you do it, water injection is a waste of time and money. Didnt assist fuel consumption and just added more "stuff" in the engine bay.

For a manifold between the delorto and the Sc I used half of a Datsun 1600 twin carb manifold. worked well in terms of fitment.

And it was all done with Joel's help too

Humpty, that beetle looks great.

Tony

yeah water injection is only there to cool the intake charge in order to avoid detonation.

most SC engine setup are inherently inefficient due to parasitic losses.

can be roughly 20-50% or more of the power gained is lost to driving it in the first place.

modern screw type blowers however are extremely efficient volumetricly and if the complete package is designed right can have more power and improved economy. But certainly wont get that from a crappy SC12 or SC14 🤪

an eaton or whipple screw blower would been a great choice.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 · 7 Apr 2015, 10:38 pm

#1011069

o the aussie designed and made Sprintex. Seen on some Harleys Mini's and Honda Jazz they are nicely compact.

www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 8 Apr 2015, 8:23 pm

#1011108

vlad01 wrote:modern screw type blowers however are extremely efficient volumetricly and if the complete package is designed right can have more power and improved economy. But certainly wont get that from a crappy SC12 or SC14 🤪

You may be right in theory but as is often the case, in practice/reality is a completely different story.

The 1776 was never dynod with this setup but power and torque wise it was on a par with my EJ22 but the stock 1600 went from 44hp stock at the wheels to 85hp at 8psi.

I did several trips to Brisbane with that setup and highway cruising got better fuel economy than stock, not by a lot but you're talking double the HP with better highway economy.
THe blower just freewheels in a vacuum when the engine isnt under load but the engine isnt having to work as hard on hills and overtaking.

Even in town it wasnt that much worse unless I was driving in race mode.