 Case/crankshaft Mods -6, Looking for opinions |
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| Jetsetsurfshop |
 Apr 2 2019, 12:08 PM
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#1
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Senior Member  Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States  |
Hey Paddock,
I'm heading down that slippery slope (already started) and been looking for information/opinions on case and crankshaft modifications. I already had my case boat tailed and was looking to complete the task by having the crankshaft knife edged. Then I found this article from Neil at Performance Development. http://performancedevelopments.com/living-on-the-knife-edge/ Sounds like he's legit and I haven't done crankshaft mods yet. Thinking I should leave it be. (IMG:style_emoticons/default/beerchug.gif) Shane |
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| Mark Henry |
Apr 5 2019, 07:50 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I agree, moon cuts, boat tail, knife edging...the gains, if any, are trivial. If your doing a serious campaign, big budget, sure go for it. But if you're mid pack, just having fun I'd spend the extra cash on the heads, twinplug, intake and exhaust first.
For my engine case I just smoothed out sharp edges, flashing, etc Porting, good cams, pistons, CR, full balancing, intake, headers are the places you need to put the money into. I reuilt a set of Extreme heads and they had custom guides with 8mm valve stems (9mm stock) SS valves. I almost did this on my engie build, but decided it wasn't worth it on a street car. The thing I didn't like about the Extreme heads (500hp 930) is it had crazy spring pounds. My engine I used the Eibach sport valve springs. |
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Posts in this topic
Jetsetsurfshop Case/crankshaft Mods -6 Apr 2 2019, 12:08 PM
sixnotfour my favorite ....
So why knife edge Porsche cranks... Apr 2 2019, 02:48 PM
stownsen914 Neil seems to be respected in the Porsche communit... Apr 4 2019, 12:42 PM Jetsetsurfshop I think I'm going to pass on the knife edging.... Apr 6 2019, 06:31 AM stownsen914 I assume 911 motor? Apr 6 2019, 11:53 AM Jetsetsurfshop
I assume 911 motor?
Yes sir.
:beer2: Apr 6 2019, 04:45 PM sixnotfour personally, I groove the bearing, crossdrill the c... Apr 6 2019, 11:58 AM Thorshammer I haven't posted on here in awhile, but I did ... Jun 7 2019, 08:38 AM |
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