 Do I need to bore the case?, Want to install 94mm P&C's in a 1.7L or 1.8L Case |
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| srwilli1978 |
 Mar 12 2015, 03:37 PM
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#1
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Newbie  Group: Members Posts: 2 Joined: 4-March 15 From: Southern California Member No.: 18,487 Region Association: Southern California  |
Hey All,
I am brand spanking new here. Been a big VW and Porsche fan for years. I have done a fair amount of Type 1 builds but the Type 4 is new to me. I have an opportunity to pick up an OK roller project 914. The car needs a lot of work but that's the fun in all of this so I am game. It has a 1.7L in it now and with the deal is an additional 1.8L short block. My question has to do with the engine cases and rebuilding with 94mm P&C's. I am looking at the kits from the Type 4 Store. I know there will probably be some case clearance-ing needed but will I need to bore the cases also to fit one of those type kits? I plan on keeping the 1.7L in the car and using the 1.8L in a Type 1 swap for my 66 Bug if the case is in good enough shape. I would like to be in 2.3L to 2.5L range when done in each of the motors. Any insight, links, or wisdom would be greatly appreciated. |
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Replies(1 - 7)
| TheCabinetmaker |
Mar 12 2015, 03:47 PM
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#2
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
I have it from an excellent source. 94mm cyls will fit.
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| Cap'n Krusty |
Mar 12 2015, 04:23 PM
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#3
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
If you use stock 94mm cylinders and pistons, they're drop in and no clearancing will be required as long as you also use the stock 2 liter crank. More importantly, the pistons won't work with the 1.7/1.8 crankshaft.
The Cap'n |
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| Dave_Darling |
Mar 12 2015, 05:20 PM
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#4
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Which 91s were stock? The 1.7s used 90mm, the 1.8s used 93mm, and the 2.0s used 94mm.
(And no case mods needed for up to 96mm bores. The 1.7 heads may need to be cut for the cylinder tops, but the case bores are fine already.) --DD |
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| Cap'n Krusty |
Mar 12 2015, 05:38 PM
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#5
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
The 91s on the tips of my typing fingers. Fixed it, Dave. Sorry.
The Cap'n |
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| Valy |
Mar 12 2015, 07:29 PM
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#6
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
The case is the same for 1.7, 1.8 and 2.0.
The 1.7 heads have smaller opening than the 1.8 and 2.0 so you will need to open up the chambers diameter. |
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| G e o r g e |
Mar 12 2015, 07:45 PM
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#7
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Dr Group: Members Posts: 1,905 Joined: 20-September 05 From: Southern Cal Member No.: 4,832 Region Association: None
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could you use the 1.7 heads, pick up 94mm Pistons and have your 90mm jugs bored out to fit?
I'm not suggesting this combo is a good match, but I thought the issue with the 1.7 head 96mm P & C's where that that walls got to thin, a 94mm would leave a little more meat on the bone but if the OP wants 2.3 - 2.5 ltr using 94's his crank and rods are going to have to change |
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| srwilli1978 |
Mar 12 2015, 08:33 PM
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#8
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Newbie Group: Members Posts: 2 Joined: 4-March 15 From: Southern California Member No.: 18,487 Region Association: Southern California |
Awesome guys. That's type of info I was looking for thank you.
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