 Type-IV Crank mods, What needs to be done? |
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| URY914 |
 Nov 4 2004, 12:11 PM
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I built the lightest 914 in the history of mankind.  Group: Members Posts: 121,070 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None  |
What needs or can be done to a 2.0 crank to improve on it?
Knife edge? Polish it? High tech coatings? Soak it in Jack? (and don't give me any shit like "drill it full of holes to lighten it' (IMG:style_emoticons/default/wacko.gif) ) Paul |
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| SLITS |
Nov 4 2004, 01:17 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
"Knife edging" involves a Dremel / Do - Mor grinder wherein you make the edge of the counterweights a "knife edge". This is supposed to help with parasitic drag caused by oil flying around inside the crankcase because it sticks to the crankshaft - you would also polish the counterweights to provide a smoother surface.
It also has the benefit of reducing crankshaft weight resulting in lower rotating mass and faster spinups. It could also expose flaws in the casting too. Of course, the type 4 crank is not counterweighted. All this applies when you are looking for fractional horsepower or you have a shit pile of time on your hands. You won't gain a pile of HP. |
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Posts in this topic
URY914 Type-IV Crank mods Nov 4 2004, 12:11 PM
brant Definitely boat tailing/knife edging..
I've b... Nov 4 2004, 12:32 PM Aaron Cox what is knife edging? Nov 4 2004, 12:48 PM brant MattR You basically sharpen one end of the connecting ro... Nov 4 2004, 12:59 PM URY914 Its when you tapper the yokes of the crank so it c... Nov 4 2004, 01:01 PM MattR Oh, you taper the crank? My mistake! I thoug... Nov 4 2004, 01:15 PM J P Stein I dunno what it is in the world of T-4, but in the... Nov 4 2004, 01:21 PM URY914 synthesisdv What about balancing? That may be more important t... Nov 4 2004, 01:26 PM Walter MattR 85 bucks from rimco for pressure plate to fan bala... Nov 4 2004, 01:28 PM Rough_Rider Knife edging & boat tailing are similar but differ... Nov 4 2004, 01:33 PM SLITS I think if I were into this again - I would do the... Nov 4 2004, 01:35 PM URY914 I'm making some carbon fiber rods.
Should be ... Nov 4 2004, 01:40 PM Britain Smith Here is a pic of mine 78mm crank...knife edged, co... Nov 4 2004, 01:46 PM Britain Smith another...
http://www.britainsmith.com/Porsche/91... Nov 4 2004, 01:48 PM SLITS "BIG BUCKS"
Nov 4 2004, 01:51 PM URY914 SICK... Nov 4 2004, 02:00 PM 914forme Dry sump it and be done! The rest becomes muc... Nov 4 2004, 03:22 PM redshift Hey man, would you like a ... sketch?
:)
M Nov 4 2004, 03:39 PM SLITS <... Nov 4 2004, 03:51 PM
Brett W Alright there are two ways to look at this.
1. Ba... Nov 4 2004, 04:48 PM |
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