 What are the differences between a 2.0 VW and 914 motor? |
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| DBF |
 Jul 1 2022, 10:19 PM
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#1
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Member  Group: Members Posts: 92 Joined: 29-August 21 From: Wisconsin Member No.: 25,865 Region Association: Upper MidWest  |
I have a 76 VW van and a 74 914, both with 2.0 Type 4 motors. I have been searching the internet, without much luck, trying to find out what modifications Porsche did to the internals of the VW Type 4 motor to bump horsepower from 67 to 95, and torque from 101 to 119. I see the heads are different. It also looks like they both used dished mahle pistons, with the Porsche having a 7.6 compression ratio, and the VW a 7.3 compression ratio. Anyone know what else was modified such as camshaft specs, crankshaft, etc. Thanks.
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Replies(1 - 8)
| era vulgaris |
Jul 2 2022, 05:45 AM
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#2
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J is for Genius Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States |
The bus pistons have a larger dish, which I've read is part of what gives them the lower compression ratio
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| 914Sixer |
Jul 2 2022, 06:05 AM
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#3
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914 Guru Group: Members Posts: 8,900 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Jake Raby covered all the information you need to know in depth. He developed a engine kit specifically for the VW Bus to maximize horsepower for it. Check Type 4 store for kit information.
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| bdstone914 |
Jul 2 2022, 07:05 AM
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#4
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bdstone914 Group: Members Posts: 4,534 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
The bus motor has hydraulic lifters with a different csm and has a lower red line.
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| TheCabinetmaker |
Jul 2 2022, 07:45 AM
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#5
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
2L bus has 1.8 heads and valves, lower compression, deep dished pistons. Not a true 2L.
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| nathanxnathan |
Jul 3 2022, 10:07 AM
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#6
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Member Group: Members Posts: 291 Joined: 16-February 18 From: Laguna Beach, CA Member No.: 21,899 Region Association: Southern California |
They're all 1971 cc — not really 2 liters (IMG:style_emoticons/default/poke.gif)
Here's a chart from the old tunacan site  |
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| Montreal914 |
Jul 3 2022, 10:50 AM
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#7
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Senior Member Group: Members Posts: 1,582 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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If I recall, the 76 912E had L-Jet. Table says D-Jet... (IMG:style_emoticons/default/confused24.gif)
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| nathanxnathan |
Jul 3 2022, 05:53 PM
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#8
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Member Group: Members Posts: 291 Joined: 16-February 18 From: Laguna Beach, CA Member No.: 21,899 Region Association: Southern California |
QUOTE(Montreal914 @ Jul 3 2022, 09:50 AM)  If I recall, the 76 912E had L-Jet. Table says D-Jet... (IMG:style_emoticons/default/confused24.gif) I think you're right, Wikipedia confirms it. Trying to verify that, I came across a thread on 912bbs.org saying that 912e engines didn't have numbers stamped on the block, and the number on the fans shroud started in "406" and not 2 letters. I don';t have much experience with 912's to know for sure. |
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| wonkipop |
Jul 3 2022, 06:14 PM
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#9
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Advanced Member Group: Members Posts: 4,396 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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QUOTE(nathanxnathan @ Jul 3 2022, 05:53 PM) QUOTE(Montreal914 @ Jul 3 2022, 09:50 AM) If I recall, the 76 912E had L-Jet. Table says D-Jet... (IMG:style_emoticons/default/confused24.gif) I think you're right, Wikipedia confirms it. Trying to verify that, I came across a thread on 912bbs.org saying that 912e engines didn't have numbers stamped on the block, and the number on the fans shroud started in "406" and not 2 letters. I don';t have much experience with 912's to know for sure. 912E is L jet. bus motor is more or less a bored out 1.8 as @TheCabinetmaker says. its all about torque. its a truck engine (thats not an insult - just what it is). the 914 2 is a porsche re-engineered VW engine. i think Hans Mezger did the design work on it? EDIT maybe the most interesting engine of them all is the least known. 1.8 AN engine for europe only. 8.6:1 compression ratio and 85 hp. pumping out nearly the same as the USA 2.0 L from 75 on. but carbies and no emissions gear and a taste for high octane fuel. if they had stuck L jet on that i reckon they might have pulled 90 hp out of it. but it would have required its own tuned L jet system = more research development $ they didn't have budget for? |
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