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> 914/4 Stroker cranks, Cheaper than Scat
Tom Perso
post Aug 13 2003, 07:44 PM
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Paul (and anyone else)...

Feel free to email me offline, we can discuss more options concerning what I've learned with the 2270.

I get free minutes and long distance after 9pm (eastern time) and I'm happy to chat about it (when I'm not wrenching on the car or other things (IMG:style_emoticons/default/wink.gif) )

Later,
Tom
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Brad Roberts
post Aug 14 2003, 02:00 AM
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This scares me... does it scare anyone else ??

I know they have to add material and weld on the counterweights... but you think they could have done a little better job on cleanup.


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Tom Perso
post Aug 14 2003, 04:59 AM
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I thought the same thing Brad. Everything else checked out fine. It was strange. If I do another motor, I would go with DMS for a crank.

Nice eye... (IMG:style_emoticons/default/wink.gif) Always a nitpicker... LOL

Later,
Tom
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makinson1
post Aug 14 2003, 06:12 AM
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Does DMS have a website?
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redshift
post Aug 14 2003, 06:41 AM
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That was ugly enough to make me not stop to look.

M
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Marlow
post Aug 14 2003, 07:35 AM
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Demello Machine Shop

http://www.demellocranks.com/
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makinson1
post Aug 14 2003, 07:58 AM
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If I don't want to shim the jugs up to raise the C.R., and I don't want to machine the rods, and I use the fat Type I rods without moving the piston pin hole, and i want to keep my WebCam Hydraulic cam (no small base circle):
What is the largest stroke I can run?
75mm?
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my15window
post Aug 14 2003, 05:48 PM
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go with Demello, he just did my 78 and I was looking at his U.P.s shippments and he does almost everbody's cranks and rods. it seems like they all end up at his shop
350 for mine and same exact crank at fat 600$
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Brad Roberts
post Aug 14 2003, 06:16 PM
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Makinson... you shim the barrels to drop compression.

You use spacers to to compensate for rod length or stroke increase.

Be VERY careful with barrel spacers on 914's.. its already tight from the valve cover to the inside control arm ear.


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cgnj
post Aug 15 2003, 08:44 AM
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Hi,
You never said what type of induction you intend to use. The think the biggest you can run on djet will be 2055. I do recall seeing a post on PP that some was running 2.2 with djet. No direct experience with that issue.

Here is my experience.

I used a 78.4mm crank, with piston pins located fo 78/80 mm stroke I had about -.058 deck. So .058*25.4=1.47mm deck in mm. The math answer is 76mm stoke should give .053 mm deck (.002in).

Size of the spacer will depend on the finished chamber volume of your heads, and what CR you will run.
.04 is the typical minimum. 60cc is the typical volume of a non-flycut 2.0 head. (My finished heads are at 52cc) Using these numbers, you would run 9.2:1. If your married to a hydro cam, you probably don't want to run this high. Play with this tool.

Aircooled.net engine calc tool

I have no idea if you can clear a stock base circle cam.

Both Tom and I used scat rods. I have gleaned from STF that the CB super race rod is smaller at the big end and requires less work or no work for 78.4 stroke.
CB Super Race Rod

Learn from my mistake.
Use belt sander and clear one rod. Send them out and let the machinist finish the others and end to end balance. I did them individually and still sent them out.

Engine width
I'm building without head gaskets. Stock width=x, new width =Y, head gaskets =1.5mm, my shims are .140
Y=X-(2*1.5mm)+(2*.140 in)
Y=X+.162 in.

To me, the marginal cost and work savings of doing 76mm stroke instead of 78.4mm is nothing. If you stroke, go carbs or aftermarket FI and do 2270.

I wanted to thank Tom publicly for keeping me in the game. There was a time early this year when I was going to toss the towel in. We corresponded a little and I was able to go on. My wife is looking for him though.

Carlos

76 2270 (2 years on blocks on 8/29/03)
76 project
74 (in the van, going to the dump on Saturday)
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URY914
post Aug 15 2003, 09:07 AM
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cgnj,
Great post with alot of very useful infomation. I'll be needing your's and Tom's advice in a few months as I start on my 2270 from a 2.0.
Knowing two guys that have actually completed the job will be a great help.

Paul
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Tom Perso
post Aug 15 2003, 01:45 PM
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Whoh, don't be sending your wife on me, I'm in enough trouble already with my fiancee!!! LOL

Carlos, I was more than happy to help and I would also be more than happy to help anyone else. I am by no means an expert, but I have traveled down the road and it's not an easy one doing it alone.

Later
Tom
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