Custom Cranksahfts

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 1 Jun 2009, 1:54 pm

#715955

Reading the first issue of VWMA again today and looking at the Targa Bug, it had a 56mm or something crank, how is this possible, and does anybody know where you can get a custom crank made?

reason being is i'd love to make a 60mm crank by 92mm motor to compete in hillclimb up to 1600cc

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 1 Jun 2009, 2:25 pm

#715958

got one here ready to go!

1303 Officially Full-On Dubber

250 posts · joined Sep 2003 · 1 Jun 2009, 3:09 pm

#715963

Sander,

why bother, just go subaru😂😂😂

Cheers

Paul

Phil74Camper Head in the Clouds

2,703 posts · joined Aug 2002 · 1 Jun 2009, 6:25 pm

#716015

Do they make Subaru engines smaller than 1600 cc? Maybe out of a Sherpa? or was it a Mighty Boy?

I've never heard of a 56 mm crank, butu you could make one out of, say, a VW 1200 cc 40-hp crank which is 64 mm. You would have to off-set grind the crank journals, bringing the centres 4mm closer to the crank centre. This makes the crank journals 8 mm smaller than stock. Custom rods required. But with 94 mm cylinders, that's 1554 cc.

If you only off-set ground the journals 4mm smaller than stock, bringing the centres in by 2mm, then you have a 60 mm stroke. With 92 mm cylinders that's 1595 cc.

You could also just use the 64 mm crank with 88 mm cylinders bored out to 89 mm, to get 1592 cc.

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 1 Jun 2009, 7:14 pm

#716028

good one paul, I suppose I deserve that! 😂😂😂

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 1 Jun 2009, 7:16 pm

#716030

Hellbugged? you've got one ready to go? where did you get one, I actually figured I should have 57.5mm with 94 barrels

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

Phil74Camper Head in the Clouds

2,703 posts · joined Aug 2002 · 1 Jun 2009, 7:20 pm

#716031

94 bore x 57.5 stroke = 1596.1 cc.
94 bore x 57.6 stroke = 1598.9 cc.
94 bore x 57.7 stroke = 1601.7 cc.

Probably easier to mess with the bore though, rather than the stroke...

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 1 Jun 2009, 7:48 pm

#716045

nah, think small cylinders to keep it nice and squishy.......and rev rev rev

the journals would be welded and offset ground, so still same rod journal..........just like welded stroker..........UNLESS you were to get one machined from a forged/counterweighted casting 🥷

reeeeeevvvvvsssssssss

62mm X 90.5 =1595cc

or it may be....

64mm X 88mm = 1557cc

i can't remember and will have to look........both size "berg special" P& B on the shelf too

62mm...................69mm.................78mm

62mm de-stroked V's 78mm stroker

damn dude, you only had to ask 😂

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 1 Jun 2009, 8:01 pm

#716048

I was wanting 92mm or bigger, so I can make the most of a twin igniton, it;s no good really with a bore smaller than 92, BMW did a heap of research apparently with their new bikes and found this out, talking to stan confirmed this

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 1 Jun 2009, 8:05 pm

#716049

sander288 wrote:I was wanting 92mm or bigger, so I can make the most of a twin igniton, it;s no good really with a bore smaller than 92, BMW did a heap of research apparently with their new bikes and found this out, talking to stan confirmed this

😂.......that must be where Dangerous,the two rocket Rods, Ross Freestone, Stoker, Kristen, Volkomen, Pagey...........and all those psycos in the USA are falling short..........only one plug per cylinder!!!, damn didn't think of that did they

get Stan to make you one then

CYA

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 1 Jun 2009, 9:48 pm

#716083

hellbugged wrote:😂.......that must be where Dangerous,the two rocket Rods, Ross Freestone, Stoker, Kristen, Volkomen, Pagey...........and all those psycos in the USA are falling short..........only one plug per cylinder!!!, damn didn't think of that did they

get Stan to make you one then

CYA

Ha ha
That cranak was custom ground at Crankshaft Engineering in Bris. We used a Toyota rod and 85.5mm bore to get under the 1300cc capacity for the regs. She revved like a banshee to 8500, was a heap of fun to drive, lacked a bit of torque tho🤪

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

1303 Officially Full-On Dubber

250 posts · joined Sep 2003 · 1 Jun 2009, 9:51 pm

#716084

sander288 wrote:good one paul, I suppose I deserve that! 😂😂😂

Sorry mate.........😂couldnt resist

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 1 Jun 2009, 10:02 pm

#716087

matberry wrote:Ha ha
That crank was custom ground at Crankshaft Engineering in Bris. We used a Toyota rod and 85.5mm bore to get under the 1300cc capacity for the regs. She revved like a banshee to 8500, was a heap of fun to drive, lacked a bit of torque tho🤪

knew you would tune in Matty

.......soooooo less stroke less torque............

"elementry dear Watson"👍

just need a seven speed close ratio box like those BMW bikes to keep a small stroke big bore in the upper rpm regions 🙅

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 1 Jun 2009, 10:18 pm

#716091

hellbugged wrote:just need a seven speed close ratio box like those BMW bikes to keep a small stroke big bore in the upper rpm regions 🙅

On the money yet again Daimo. Can you please help me find one of those 7 speeds.....

Good to see your back online mate, must have finished wrenching on that Vrex type three thingy.😂😂

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 2 Jun 2009, 8:50 am

#716134

oh dear here we go again............

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 2 Jun 2009, 8:55 am

#716137

Craig Torrens wrote:oh dear here we go again............

"on the money"......hahaha yeah right.

What's your point Craig?

sorry we shouldn't bag any torque mongers.....all in jest you know, how many people have 1300cc hi po vw engines let alone 7 speed box's?

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 2 Jun 2009, 9:08 am

#716139

my point ?

just a question..why did you go to all the trouble to come up with the short stroke 1300 combo ?

Sander, i think you will find a destroked 69mm crank with 94's would be a good combo 😎.......but its over 1600!

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 2 Jun 2009, 9:10 am

#716140

So you can fit in big valves

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 2 Jun 2009, 9:17 am

#716142

ha ha......geez how big were the valves !

polak Everything is alright with enough Vodka :P

913 posts · joined May 2009 · 2 Jun 2009, 12:21 pm

#716179

1303 wrote:Sander,

why bother, just go subaru😂😂😂

Cheers

Paul

if you want to open that can of worms again, the "subaru invasion" page is still running hahaha😂😂😂

VW - helping put oil back into the ground for over 60 years

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 2 Jun 2009, 2:32 pm

#716197

Craig Torrens wrote:Sander, i think you will find a destroked 69mm crank with 94's would be a good combo 😎.......but its over 1600!

but he wants 1600cc!

if the magic ratio of hp to CC's comes from a 69 X 94 engine...

why wouldn't you want to reduce the cylinders size relative to the de-stroke to keep this magic ratio close

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 2 Jun 2009, 3:16 pm

#716204

hellbugged wrote:
Craig Torrens wrote:Sander, i think you will find a destroked 69mm crank with 94's would be a good combo 😎.......but its over 1600!
but he wants 1600cc!

if the magic ratio of hp to CC's comes from a 69 X 94 engine...

why wouldn't you want to reduce the cylinders size relative to the de-stroke to keep this magic ratio close

Daimo you might be getting too technical now....😂😂😂...out with the calculator boys🤓

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Phil74Camper Head in the Clouds

2,703 posts · joined Aug 2002 · 2 Jun 2009, 3:57 pm

#716212

You could press buttons on your calculator endlessly. It's easier to do it in MS Excel.

Put the bore in mm in column A, line 1. Put the stroke in mm in column B, line 1.

To work out the engine size, put the following calculation in Column C, line 1:

=((A1/2)*(A1/2))*12.566*B1/1000

The answer will be in cc. Repeat down the spreadsheet for as much as you like and you can plug different numbers in A and B all day.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 2 Jun 2009, 6:47 pm

#716250

hellbugged wrote:
Craig Torrens wrote:Sander, i think you will find a destroked 69mm crank with 94's would be a good combo 😎.......but its over 1600!
but he wants 1600cc!

if the magic ratio of hp to CC's comes from a 69 X 94 engine...

why wouldn't you want to reduce the cylinders size relative to the de-stroke to keep this magic ratio close

who said that was the magic ratio ?

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 2 Jun 2009, 9:41 pm

#716313

Craig Torrens wrote:ha ha......geez how big were the valves !

Big enough to win class in Targa first time out!!!

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

LIFE IN THE LOW LANE All people have the right to stupidity but some abuse the pr

2,534 posts · joined Mar 2007 · 2 Jun 2009, 10:32 pm

#716323

I'm guessing Matt that you wanted to be "legal" and not running larger capacity than you are "legally" allowed hence the homework on getting the capacity close to the limit and spending a lot of time on heads etc etc.

It is always nice to win but even nicer to win knowing you are 100% legal to the rules. My uncles rule of thumb when building Formula Vees. Nothing better than beating known cheats with a totally legal engine he reckons.....

ACCEPT THAT SOME DAYS YOU ARE THE PIDGEON AND SOME DAYS YOU ARE THE STATUE

Alder Outlaws VW Racing - check it out on fb!!

coletrickle Wolfsburg Wizard

661 posts · joined Apr 2009 · 4 Jun 2009, 10:57 am

#716529

Correct that engine had no torque to speak of but I've driven it years ago and boy did that engine rev!An old saying is its not how fast you go its how you go fast.if every body had a 2332 life would be so boring😂