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74mm crank?
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Bug-er
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PostPosted: Sun Mar 27, 2005 5:30 am    Post subject: 74mm crank? Reply with quote

anyone have any experience with these?
thinkng about using one with 90.5mm barrels but no one seems to use them, they not worth it?
Adam
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Glenn Premium Member
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PostPosted: Sun Mar 27, 2005 5:35 am    Post subject: Reply with quote

90.5x74=1904cc

Some of us use them. I'm on my second 1904. The first was 140hp and i put 80,000 miles of daily driving on it. My current has 180hp andhas 16,000 of mostly pleasure driving.

When they say the 74 will drop in with no clearencing... that's not always true. My Berg needs some minor work, but easy enough to fix.

BTW... I drive it like i stole it. So no easy life for my engines.
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Bug-er
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PostPosted: Sun Mar 27, 2005 5:52 am    Post subject: Reply with quote

Is going to have similar power to a 1915 motor?

spec I have at the moment
cb 044 heads 35.5x40 ported polished etc
engle 120
scat I beams

would like a bit more power but I dunno if my woney would be better spend on MSD ignition

what spec do you run? why dont many people run these setups?
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PostPosted: Sun Mar 27, 2005 5:53 am    Post subject: Re: 74mm crank? Reply with quote

Bug-er wrote:
anyone have any experience with these?
thinkng about using one with 90.5mm barrels but no one seems to use them, they not worth it?
Adam


Several people use 74 cranks. The thing with those cranks is that they are just as expensive as the larger stroke crankshafts on the market today.
Bigger engine for same money usually means the larger strokes are more popular.
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VW Tazz
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PostPosted: Sun Mar 27, 2005 8:22 am    Post subject: Reply with quote

Glenn wrote:
BTW... I drive it like i stole it. So no easy life for my engines.


HAHAHAH

Laughing I drive my little 1641 like i rented it. Laughing it's like a Timex man Twisted Evil
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PostPosted: Sun Mar 27, 2005 11:13 am    Post subject: Reply with quote

Glenn wrote:
90.5x74=1904cc

Some of us use them. I'm on my second 1904. The first was 140hp and i put 80,000 miles of daily driving on it. My current has 180hp andhas 16,000 of mostly pleasure driving.

When they say the 74 will drop in with no clearencing... that's not always true. My Berg needs some minor work, but easy enough to fix.

BTW... I drive it like i stole it. So no easy life for my engines.


How do you figure CC? I am thinking of a 90.5x72 but I don't know what that makes. I mean I heard 90.35 made it a 1776 but I wanted to figure out how to calculate a 1835 so I can figure out what engine/how much money I am going to build
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1955ccbug
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PostPosted: Sun Mar 27, 2005 11:17 am    Post subject: Reply with quote

http://www.aircooled.net/gnrlsite/resource/specgeninfo/calcs.htm
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bk63rag
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PostPosted: Sun Mar 27, 2005 11:21 am    Post subject: Reply with quote

Theres charts out there with all the cranks and piston sizes lke 69 crank 90.5 1776/92s 1835/94s 1915.I knew a guy with a 1904 74/90.5 he was pretty happy with it Smile there are tons of engine combos and sizes stay away from any that invove the 92s there bad news.
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jackstraw
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PostPosted: Sun Mar 27, 2005 11:27 am    Post subject: Reply with quote

92's are bad... well I guess there goes that idea Laughing guess I'll stick with 90.5 and a bigger crank
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PostPosted: Sun Mar 27, 2005 11:47 am    Post subject: Reply with quote

The formula to figure cc is BORE X BORE X STROKE X .0031416

90.5 X 90.5 X 72 X .0031416 = 1852.59cc
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Bug-er
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PostPosted: Mon Apr 18, 2005 5:43 am    Post subject: Reply with quote

so does anyone know if any machining will be required
I have a new stock crank case,
90.5mm pistons for non stroker
scat I-beam rods of standard length
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Type4parts
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PostPosted: Mon Apr 18, 2005 5:52 am    Post subject: Reply with quote

Use a WBX 2.1 crank and you will get a VW Factory forged 76.4mm Stroker Crankshaft with FIVE bolts holding the Flywheel on and be able to use a clutch up to 228mm.
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PostPosted: Mon Apr 18, 2005 12:17 pm    Post subject: Reply with quote

Bug-er wrote:
so does anyone know if any machining will be required
I have a new stock crank case,
90.5mm pistons for non stroker
scat I-beam rods of standard length


Yes, the case and heads will have to be "opened up" for the larger cylinders to fit.
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Bug-er
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PostPosted: Tue Apr 19, 2005 3:12 am    Post subject: Reply with quote

keifernet wrote:
Bug-er wrote:
so does anyone know if any machining will be required
I have a new stock crank case,
90.5mm pistons for non stroker
scat I-beam rods of standard length


Yes, the case and heads will have to be "opened up" for the larger cylinders to fit.


sorry I meant will the stock rods etc be ok with the 74mm crank?
will I have to clearance the crank?
someone must know going to order it as soon as I know
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PostPosted: Tue Apr 19, 2005 4:33 am    Post subject: Reply with quote

Stock rods should work on a 74 with no clearencing.
A 74 crank should drop in with no clearencing
The crank should drop in the case with no clearencing.

I say should, but I can't say they absolutly will. You might need to hit a few areas with a die grinder or a dremel tool. The only way to know is to mock up your engine and check all clearences.

You will have to machine the case and heads for the 90.5mm pistons.
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PostPosted: Tue Apr 19, 2005 6:58 am    Post subject: Reply with quote

"WBX 2.1 crank and you will get a VW Factory forged 76.4mm Stroker Crankshaft"

Is that crank counterweighted? Seems like a bargain stroker if you find one cheap from a broken shortblock; but if not counterweighted, keep the rev's to low 5's with a good balance job.
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PostPosted: Thu Apr 21, 2005 11:08 am    Post subject: Reply with quote

Rome wrote:
"WBX 2.1 crank and you will get a VW Factory forged 76.4mm Stroker Crankshaft"

Is that crank counterweighted? Seems like a bargain stroker if you find one cheap from a broken shortblock; but if not counterweighted, keep the rev's to low 5's with a good balance job.


I wouldn't assume it is unless they say so.

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