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Using a smaller crank Pulley
Thanks to Kevin930T I purchased an Electromotive XDI ignition set off of the used parts section of the forums.
The only problem is that the setup came off a 2.0L and therefore has a smaller crank pulley. Is there any problem with running the smaller pulley on a later car?
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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04-23-2018, 09:41 AM
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Mighty Meatlocker Turbo
Join Date: Apr 2016
Location: North TexASS
Posts: 18,533
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Rich, I don't know the answer right off, but I know that you don't want to speed the engine fan up to the point that it cavitates and stops moving air efficiently (aka - the fan pulley and crank pulley ratio have to be in sync) - so definitely worth looking into and I know that there is a lot more info on this in the 911 forum (from people like J. Walker, Bruce/flatsixpack, etc.).
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04-23-2018, 09:49 AM
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Thanks Ronnie. I certainly assumed that the fan speed would increase, but wouldn't have assumed that it could be detrimental. I'll take a look on the 911 forum.
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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04-23-2018, 09:54 AM
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Registered
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It will increase in proportion to the changed diameter - eg 10% smaller = 10% faster fan. The only solution if you wanted to keep same fan speed would be to reduce fan pulley same amount - if possible.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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04-23-2018, 07:56 PM
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Registered
Join Date: Jun 2006
Location: Ogden Valley area, UT
Posts: 1,047
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maybe I am wrong, but wouldn't a smaller dia crank pulley actually slow the fan speed down?
~chris |
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04-24-2018, 04:08 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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Y'all are backwards.
He's stating the crank pulley is smaller. This would slow down the fan.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood  , Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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04-24-2018, 04:34 AM
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Bruiser
