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Denzel eng. build up
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Mr. Okrasa Premium Member
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Joined: May 20, 2000
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PostPosted: Tue Nov 10, 2009 8:22 am    Post subject: Denzel eng. build up Reply with quote

After waiting several months for SCAT to have their forged chromoly "Superlite" crankshafts made-up,
I finally have the bottom end and ready to start assembling my Denzel bottom end..... Cheers!
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com


Last edited by Mr. Okrasa on Tue Nov 10, 2009 8:57 am; edited 2 times in total
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grueni
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PostPosted: Tue Nov 10, 2009 8:53 am    Post subject: Reply with quote

wow..high end in material and also in money Sad
whats the plan for the engine in cc and all the stuff?
that will become exciting
beautiful
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Mr. Okrasa Premium Member
Original Old Speed


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PostPosted: Tue Nov 10, 2009 9:01 am    Post subject: Reply with quote

grueni wrote:
wow..high end in material and also in money Sad
whats the plan for the engine in cc and all the stuff?
that will become exciting
beautiful

Dont want to divulge too much information at the moment. Im building two of these at the same time
and the owner of one does NOT want any info. given out on his Denzel engine build. Cheers!
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com
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grueni
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PostPosted: Tue Nov 10, 2009 9:30 am    Post subject: Reply with quote

but if one is yours Wink nene kist kidding. it's more than enough to see that rarity build up
have fun with it!
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sled
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PostPosted: Tue Nov 10, 2009 12:22 pm    Post subject: Reply with quote

oh man, one of my favorite engines. Are those DCM-2's?

looking forward to updates.
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TomSimon
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PostPosted: Tue Nov 10, 2009 1:26 pm    Post subject: Reply with quote

This will be a fun build to watch... there's not many Denzel heads around to be had, that pair looks real clean
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Teeroy Premium Member
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PostPosted: Tue Nov 10, 2009 2:00 pm    Post subject: Denzel eng. build up Reply with quote

What strokes is Scat offering? Are they 36hp VW mains or 356 Porsche?
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gimmesomeshelter
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PostPosted: Tue Nov 10, 2009 5:38 pm    Post subject: Reply with quote

Hello-

They offer a 74mm stroke with 55mm mains (356 SC/912). You can, however, have a crank custom ground. Wink

Paul
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Mr. Okrasa Premium Member
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PostPosted: Tue Nov 10, 2009 5:46 pm    Post subject: Reply with quote

gimmesomeshelter wrote:
Hello-

They offer a 74mm stroke with 55mm mains (356 SC/912). You can, however, have a crank custom ground. Wink

Paul

Paul is right! I have (3) that SCAT "made" with 50mm mains and (2) that have 55mm mains.
I got a small discount for buying (5) SCAT "Superlite" crankshafts at once...... Cheers! Cool
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com
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gimmesomeshelter
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PostPosted: Tue Nov 10, 2009 6:28 pm    Post subject: Reply with quote

Hello-

While I understand that installing a 55mm crank into a 36HP case has its challenges, it also has its rewards. Stiffness (torsional rigidity) is proportional to the 4th power of the diameter. All other things being equal, a 55mm crank is 46% stiffer than a 50mm crank. Not bad for a 10% increase in diameter.

Paul
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TomSimon
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PostPosted: Wed Nov 11, 2009 3:22 pm    Post subject: Reply with quote

gimmesomeshelter wrote:
Hello-
a 55mm crank is 46% stiffer than a 50mm crank. Not bad for a 10% increase in diameter...


unfortunately that's not the entire story... torsional rigitity is one part of the equation. There is also bending where the cheeks meet the main journal, and cheek meets the rod journal. The larger the rod journals and main journals and less the stroke, the stronger the crank. This overlap, often refered to as 'lap' in crank grinders parlance, is a big deal in 3-main bearing cranks like a VW. Who's to say which one matters most, or if we should care at relatively low power levels Neutral

IMO if a guy has a choice, the bigger the diameter the better, to the point in which you now weaken the case but alignboring it to accomodate those larger main bearings Wink then there is the problem of paying $400 for a set of Porsche main bearings Rolling Eyes
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Mr. Okrasa Premium Member
Original Old Speed


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PostPosted: Wed Nov 11, 2009 4:42 pm    Post subject: Reply with quote

Tom Simon wrote:
gimmesomeshelter wrote:
Hello-
a 55mm crank is 46% stiffer than a 50mm crank. Not bad for a 10% increase in diameter...


unfortunately that's not the entire story... torsional rigitity is one part of the equation. There is also bending where the cheeks meet the main journal, and cheek meets the rod journal. The larger the rod journals and main journals and less the stroke, the stronger the crank. This overlap, often refered to as 'lap' in crank grinders parlance, is a big deal in 3-main bearing cranks like a VW. Who's to say which one matters most, or if we should care at relatively low power levels Neutral

IMO if a guy has a choice, the bigger the diameter the better, to the point in which you now weaken the case but alignboring it to accomodate those larger main bearings Wink then there is the problem of paying $400 for a set of Porsche main bearings Rolling Eyes

Granted! I agree with Tom. These "little" engines that are being built for the street will never or hardly ever see RPM blasts of over 5500 rpms. The lifter/cam/valve spring design in the 25hp/36hp engine was never intended to go beyond 5500 rpm's safely so unless you do something with those "weak links" first, then I would worry about what size the crank journals are.....In my 35+ years of building these early engines, I have never had a crankshaft break either stock, stroked or billet. If you are experiencing broken crankshafts then something else is wrong?!?! These engines are NOT producing the HP that the drag racers are laying down at the strip.

Another note: When you machine the magnesium case for the larger 55mm main bearings, you are weakening the block. Remember, the S-90/SC
and 912 Porsche engines all use ALUMINUM blocks which were designed to use the larger 55mm main bearings. Cheers! Mr. Okrasa Cool
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com
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gimmesomeshelter
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PostPosted: Wed Nov 11, 2009 10:11 pm    Post subject: Reply with quote

Mr. O'

Quote:
In my 35+ years of building these early engines, I have never had a crankshaft break


Is there a common point(s) of failure for these engines?

Paul
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Jake Raby
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PostPosted: Wed Nov 11, 2009 10:51 pm    Post subject: Reply with quote

If you aren't breaking parts you aren't making enough power.

I have a 3 piece 36HP crankshaft on my trophy shelf.
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Mr. Okrasa Premium Member
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PostPosted: Wed Nov 11, 2009 11:57 pm    Post subject: Reply with quote

Jake Raby wrote:
If you aren't breaking parts you aren't making enough power.

I have a 3 piece 36HP crankshaft on my trophy shelf.

Yeah!........I know. Boo hoo!
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com
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sled
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PostPosted: Wed Nov 25, 2009 11:18 am    Post subject: Reply with quote

Any updates? Very Happy
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Mr. Okrasa Premium Member
Original Old Speed


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Location: Eastside, Costa Mesa. So. Califas...Loco's ;-)
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PostPosted: Wed Nov 25, 2009 11:45 am    Post subject: Reply with quote

sled wrote:
Any updates? Very Happy

nope..... #Sleep
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See my Instagram: https://www.instagram.com/okrasa/

1959 VW Karmann Ghia Coupe / Bamboo-Green / Denzel 1300cc / OG. owner, paint Wink

Denzel engine running. See this link: https://youtu.be/DgUlsQDTXTE

VW www.Okrasa.com
356 www.PreA356.com
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