2.0 bus engine vrs. 2.0 914, beside the heads whats different? |
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2.0 bus engine vrs. 2.0 914, beside the heads whats different? |
orange914 |
Nov 9 2007, 10:56 PM
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#1
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
a friend wants to build a good but resonably priced engine for his 914. he has a 2.0 bus engine and a 914 1.7 engine. we're looking into the best combo. to build
1 what differences are in the bus vrs. 914 2.0 engines (deside the heads and windage tray?) 2 does a BUS case have "GA" #'s and the grooves for the windage tray? 3 will 94mm or 96mm cylinders and/or the 71mm (2.0) crank fit the 1.7 case w/o machining? (IMG:style_emoticons/default/beerchug.gif) mike |
sww914 |
Nov 9 2007, 11:10 PM
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#2
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
I don't know about the bus engines, but I do know that I have a 1.7 case with a 2.0 crank and 96's, I didn't need to do any machining except for an align bore.
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orange914 |
Nov 9 2007, 11:27 PM
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#3
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
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gregrobbins |
Nov 9 2007, 11:28 PM
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#4
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Member: Team NARP Group: Members Posts: 1,515 Joined: 23-March 04 From: Arizona Member No.: 1,844 Region Association: Southwest Region |
Some bus cases had a mechanical fuel pump and you would need to block that off. Also, you would have to tap and drill for the oil dip stick.
Talked to Jake about bus cases one time. He suggesed that a bus motor is more likely to be beat up and out of alignment due to the heavy work a bus motor has to do compaired to a 914 motor. Jake likes the 1.7 cases for his big builds. Use that one. |
toon1 |
Nov 10 2007, 02:53 AM
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#5
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
Mike, there are a few differences, use a 1.7 case, there plentiful
That offer above sounds good |
914Mike |
Nov 10 2007, 04:03 PM
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#6
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Member Group: Members Posts: 330 Joined: 27-January 03 From: San Jose, CA Member No.: 198 |
While the 2.0 bus crank is identical to the 2.0 914 crank, the rods are heavier. I measured 914 rods at about 760g (IIRC) vs. 790g to over 800g for the bus rods. This makes a BIG diff at redline... (IMG:style_emoticons/default/barf.gif)
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Madswede |
Nov 10 2007, 04:17 PM
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#7
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Flat Out Driver Group: Members Posts: 853 Joined: 13-September 06 From: Rio Rancho NM Member No.: 6,831 Region Association: Rocky Mountains |
I have a 2.0 bus engine in my 73 right now, which I didn't put in ... it's a boat anchor of a motor, and although I have to give it credit for not dying on me (despite several attempts to do so, which turned out to be just warning shots).
I know the compression is significantly lower, and comparably so is HP (though I think you might gain low-end torque - if you find a decent bus motor in the first place, unlike mine). If you plan to change all that and just use the case, then ... more power to ya. The problems I'd had with mine were initially based on the fact that the 1.7 Djet wasn't working at all on that poor motor ... and the fact that it was only running on 3 cylinders for a long time due to something broken on the rocker arm assembly. Which broke again, in a different place, later ... lots oil. Speaking of that, I get ~500 miles to the gallon ... of OIL. (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/mad.gif) BTW, the dipstick is in the exact same place on the bus motor as a teener 2.0. When I take it out, it's going to be donated to a VW parts guy in town. I've had enough of this poor ol' thing. My recommendation? Stick with a 1.7 for sure. - Nelson |
Al Meredith |
Nov 10 2007, 08:59 PM
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#8
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Senior Member Group: Members Posts: 960 Joined: 4-November 04 From: Atlanta, ga Member No.: 3,061 |
All the cases are interchangable. The 2.0L bus engine has low compression and huge dishes in the top of the oistons. Bus heads have smaller valves. Have the heads redone by Len Hoffman with bigger seats and valves. Have the 2.0 cylinders bored to 96MM and inatall KB pistons from Jake . Add a jake cam and you've got a great engine.
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Krieger |
Nov 10 2007, 10:54 PM
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#9
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Advanced Member Group: Members Posts: 4,711 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
The flywheel and clutch are different. The bus clutch is 228mm. The flywheel is lighter. This is what I run in mine. I further lightened it. The center of the flywheel must be bored for the pilot bearing.
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