Need help 36hp stroker!

Louis · Posted: Sat Mar 14, 2009 10:18 am Post subject: Need help 36hp stroker!

here what i have:

36hp
okrasa head
okrasa 69.5 crank

now my problem is pistons and cylinder...

is the 83mm 40hp bigbore kit fit the 36hp rods?
how thick the shim as to be get comp ration of 8:5.1

what modification do i have to do to make it work?

THanKs!!!!

beetleseb · Posted: Sat Mar 14, 2009 1:39 pm Post subject:

I'm doing something similar at the moment

I belive the 40hp big bore pistons will fit as the wrist pin is 20mm but the cylinder will be a lot of work.

Porsche cylinders can be made to work but they are not cheap.

You may be able to use chevy journal con rods ment for later vw engines with overseized bearings (they are 2" 36hp is 50mm) to get the 22mm wrist pin if that helps

Good luck

Seb

grueni · Posted: Sat Mar 14, 2009 4:47 pm Post subject:

chevy rods a way to long for a 36hp engine.

beetleseb · Posted: Sun Mar 15, 2009 3:20 am Post subject:

Louis · Posted: Wed Mar 18, 2009 12:43 am Post subject:

help someone??

please....

someone done it?

help a brother out!!

grueni · Posted: Wed Mar 18, 2009 3:38 am Post subject:

what kind of help do you need?
pistons will fit...cylinders only with alot of work stud holes and dimensions ...
you need to open case and heads und cylinders too.
and if you do this you can make your hads or (and) cylinders to your compression ratio...good kuck

Louis · Posted: Thu Mar 19, 2009 12:42 pm Post subject:

thanks...
all this is a puzzle... can get confusing and pricey if you buy the wrong parts!

just trying to follow someone else experience with this kind of project.

cheers

grueni · Posted: Thu Mar 19, 2009 1:44 pm Post subject:

for sure you are right. but it's also "just" an engine Wink

Louis · Posted: Fri Mar 20, 2009 12:14 am Post subject:

what about a 69.5 okrasa crank with 356 piston rods and 22mm pin piston would it work?
is the okrasa crank or stock 36hp crank fit the 356/912 rods?

grueni · Posted: Fri Mar 20, 2009 7:26 am Post subject:

noo,...sorry. smile
you sound like a child in candyshop Wink

beetleseb · Posted: Fri Mar 20, 2009 8:51 am Post subject:

Its a dark art these early engines and too many people are keeping quiet!

Luckily they always correct me when I'm wrong so heres what I know, please let me know where I mess up!

36hp crank = 50mm rod journals
Porsche crank = 53, 54 or 55 (cant remember of the top of my head)
porsche and later 1300 + vw pistons = 22mm wrist pin
36 and 40hp = 40hp wrist pin
40hp plus barrels have a different stud spacing so won't bolt on

You can get a big bore 83mm piston for a 40hp with the 20mm wrist pin. You can search on the mahle website for products but I can't find a 83mm with a suitable wrist pin

On the engine I'm building now I'm hoping to use

83mm big bore cylinders
Highly modded barrels from a 1500sp (cue angle grinder Shocked

)
64mm crank and con rods
Heads with 33in and 30 out and just a bit of porting
A mr okrassa cam
8.5 to 1 comp ratio
Twin 28pci carbs

Hopefully I will get 45-50 bhp.

Good luck with yours

Seb

Julio Iniguez · Samba Member Joined: April 19, 2004 Posts: 130

The 40hp big bore do work and it's not that bad. Turn them 90 degrees and they fit over the stud patern and the way we trimmed them was with a die grinder & cutting disk. We measured how much had to be trimmed then with the grinder scored the fin about half way through grabbed some channel locks and slowly bent up til the fin snapped on the line. All four took about an hour.

Julio

mightymouse · Posted: Fri Mar 20, 2009 7:14 pm Post subject:

Specs on this cam your speaking of? anyone? guess i could just email joe..LOL
_________________
Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.
Thomas Jefferson

Note to EVERYONE.
Know your ZDDP levels or you WILL lose a cam and lifters.

Louis · Posted: Sat Mar 21, 2009 12:03 am Post subject:

thanks Julio!
i will order a set of 40hp bigbore.

i was reading a okrasa article saying that the original kit was coming with 4 head spacers and 4 pushrod spacers... anyone using those and who is machining something like that?

cheers

grueni · Posted: Sat Mar 21, 2009 12:15 am Post subject:

i don't know if mr. okrasa do it too, but okrasa ,öttinger use in his old okrasa engines the old 356 preA cams.

Louis · Posted: Sat Mar 21, 2009 10:46 am Post subject:

i was reading a few old post from coolairx2, he said that he has a okrasa motor with 69mm crank and 912 82mm pistons. said that Joe sold him the pistons...how the hell did he fit the 22mm pin on the okrasa crank?

beetleseb · Posted: Sat Mar 21, 2009 11:43 am Post subject:

The mr okrassa cam is basically 36 reground to a pre a. He sent me the specs and its a fast road, tame race cam acording to my head guy.

As soon as I've sold some bits I'll buy one

You can lose the bushes on the con rods to run 22mm but its not a great Idea and will limit you to about 30,000 miles. Or you could bush up the pisyons but its another thing to go wrong!

Seb

Louis · Posted: Sat Mar 21, 2009 2:50 pm Post subject:

can you post the specs of that cam?

beetleseb · Posted: Sun Mar 22, 2009 2:36 am Post subject:

Why not find Mr Okrassa ad and ask him?

http://www.thesamba.com/vw/classifieds/detail.php?id=559415

He sent me the specs but I'll ask him before I post them

Seb

gimmesomeshelter · Posted: Sun Mar 22, 2009 11:27 am Post subject:

Hello-

Have you considered having a set of pistons made to your specs? JE will do it for ~ $800.

BTW, have you read "Souping The Volkswagen"? http://www.oldspeed.ch/pages/press-souping.htm If not, it will probably answer many of your questions.

Paul
_________________
"I would rather have questions that can't be answered than answers that can't be questioned."

Richard Feynman


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