Turbo type4 fastback:)

This is the place to discuss, or get help with any of your Type 4 questions.

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jonas n
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Post by jonas n » Sun Nov 13, 2005 1:44 pm

Square aluminium would be cool! :shock: but mine is ordinary steel...

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Ephry73
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Post by Ephry73 » Sun Nov 13, 2005 1:45 pm

haha. ok, i didn't mean it like that :P


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peumansjoris
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Post by peumansjoris » Sun Nov 13, 2005 3:01 pm

The lift is 10,71mm... dont know how the duration it´s measured....
I guess that's the rocker-lift and that means the camlift is 10.71 / 1.3 = 8.23 ?
Is that right ?

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jonas n
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Post by jonas n » Sun Nov 13, 2005 3:05 pm

B.A.S. 12.9 flywheel bolts
Tell me more Wally!..... :wink:

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Wally
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Post by Wally » Mon Nov 14, 2005 4:59 am

jonas n wrote:
B.A.S. 12.9 flywheel bolts
Tell me more Wally!..... :wink:
Spezial Schwungradschrauben
12 K Qualität mit 13,1 mm geschliffenem Bund.
Je nach Toleranz der Schwungräder anpassen erforderlich.

Zusätzliches verstiften siehe Bearbeitung!
23070
EUR 46,29


The above is copied from the www.ahnendorp.com site...I would have thought you would have the catalog at home :wink: , but its online now as well, unfortunately for our english speaking friends, not everthing has been translated.

The picture of those bolts didn't copy with the text, but ist on page 5 of Typ 4 section on the german online catalog.

Best regards,
Walter
T4T: Type 4 Turbo engine, under construction

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jonas_linder
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Post by jonas_linder » Mon Nov 14, 2005 7:07 am

Picture :

Image

;)

Thanks for the info Wally!

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Wally
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Post by Wally » Mon Nov 14, 2005 2:24 pm

Sure, no problem; any help/ideas I can give you to make a reliable Type 4 Turbo is well worth the small effort it is to me 8)
T4T: Type 4 Turbo engine, under construction

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jonas n
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Post by jonas n » Mon Nov 14, 2005 2:25 pm

Thanks Wally!

i might see if i can get some of those...

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jonas n
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Post by jonas n » Mon Nov 14, 2005 2:28 pm

do i understand right if i have to drill the flywheelholes together with the crankshaft? :wink:

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Wally
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Post by Wally » Mon Nov 14, 2005 3:07 pm

jonas n wrote:do i understand right if i have to drill the flywheelholes together with the crankshaft? :wink:
No, certainly not; It says - and I can confirm this (I have used several sets already) - that you 'may' have to hone the flywheel for the tight fitting 'neck' of the bolt, which is exactly 13,1mm. Your flywheel holes are 'about' 13mm, to fit the normal M12 bolts.

Crankshaft threads have nothing to do in this case with the 5 bolts fitting tight in the flywheel. Threads in crankshaft remain the same.

From experience, I can advise you to have the holes be reamed by BAS to the 13,10 mm as this is usually necessary, not to 'gall' the machined neck of the bolts.
This is easy for me, as I live about a 20-30 minute drive from Ahnendorp and I can wait for the work to be done while I am there, especially when I call them first..., but sending your flywheel by mail is probably not very cost effective, so maybe you can/will have this work to be done locally. I am not sure it BAS uses a special fixture for this, but alignment with the crank-threads is crucial of course.

Good luck,
Walter
T4T: Type 4 Turbo engine, under construction

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Piledriver
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Post by Piledriver » Mon Nov 14, 2005 9:32 pm

IIRC Jake sells those bolts on this side of the Atlantic.
(Or something very similar)

And that motor mount is a work of art!

In steel you should be able to use it as a jack point!
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

HotStreetVw
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Post by HotStreetVw » Mon Nov 14, 2005 10:52 pm

whats the purpose of increasing the size inside the flywheel? I dont see how that would solve a problem, the bolt is still going to shear on the small cross section, or the transition between small to large(stress concentration)

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Rescue912
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Post by Rescue912 » Mon Nov 14, 2005 11:05 pm

whats the purpose of increasing the size inside the flywheel
It decreases the amount of backlash / free play between the bolts and the holes so there is less movement between the two parts. Helps in case they were oval'd out by a loose bolt at some point too.

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Piledriver
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Post by Piledriver » Tue Nov 15, 2005 6:52 am

HotStreetVw wrote:whats the purpose of increasing the size inside the flywheel? I dont see how that would solve a problem, the bolt is still going to shear on the small cross section, or the transition between small to large(stress concentration)
Think 13.1mm diameter dowel pins, but made of pure unobtainium, and screwed in at 100 ft/lbs.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

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Wally
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Post by Wally » Tue Nov 15, 2005 9:08 am

No, actual unobtanium (no joke) is the stuff 'we' made my exhaust guides from 8) , but yes, I forgot to tell that those higer quality bolts are torqued with a higher torque value. The exact numer is in the BAS instructions paper that comes with a set.
T4T: Type 4 Turbo engine, under construction

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