 Simple Questions: Pistons and Heads? |
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| KaptKaos |
 Dec 23 2012, 10:43 AM
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#1
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Family  Group: Members Posts: 4,009 Joined: 23-April 03 From: Near Wausau Member No.: 607 Region Association: Upper MidWest  |
1) are stock 2 liter pistons dished?
1.5) 2 liter pistons are 93mm, correct? 2) how do I tell a bus 2 liter head from a 914 2 liter head? Are there additional ports in the head? 3) what are the valve sizes in a the 2 liter head? TIA |
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Replies(1 - 6)
| Black22 |
Dec 23 2012, 11:38 AM
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#2
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Senior Member Group: Members Posts: 886 Joined: 1-November 07 From: Creswell, OR Member No.: 8,290 Region Association: Pacific Northwest |
1) not positive, but yes? For some reason I thought bus pistons were dished.
1.5) I think they are 94mm 2) 3 bolt intake pattern...and casting numbers. 3) 42 x36 mm valves Hope that helps. Someone else will surely chime in and correct me and give you more detailed info. |
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| euro911 |
Dec 23 2012, 11:40 AM
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#3
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,849 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California 
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Slightly dished (unless they're euro)
94mm Three intake manifolds studs. '75/'76 have air injection ports in the exhaust 42m intake, 36mm exhaust EDIT: You beat me to it, Mike |
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| Black22 |
Dec 23 2012, 10:24 PM
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#4
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Senior Member Group: Members Posts: 886 Joined: 1-November 07 From: Creswell, OR Member No.: 8,290 Region Association: Pacific Northwest |
QUOTE(euro911 @ Dec 23 2012, 09:40 AM)  Slightly dished (unless they're euro) 94mm Three intake manifolds studs. '75/'76 have air injection ports in the exhaust 42m intake, 36mm exhaust EDIT: You beat me to it, Mike You gave more detail and I was just guessing from my memory of all the threads I've read. I've never even owned a 2 Liter! Thanks for the confirmation that I'm not losing my memory......completely that is! (IMG:style_emoticons/default/laugh.gif) |
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| Dave_Darling |
Dec 24 2012, 08:04 AM
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#5
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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US 2.0 pistons were dished. The original Euro-spec 2.0 pistons were also dished, but had a different (smaller) dish. Later European-spec 2.0 pistons were not, and are often called flat-topped.
The 2.0 Bus pistons had a larger dish. --DD |
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| KaptKaos |
Dec 24 2012, 10:52 AM
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#6
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Family Group: Members Posts: 4,009 Joined: 23-April 03 From: Near Wausau Member No.: 607 Region Association: Upper MidWest |
QUOTE(Dave_Darling @ Dec 24 2012, 06:04 AM) US 2.0 pistons were dished. The original Euro-spec 2.0 pistons were also dished, but had a different (smaller) dish. Later European-spec 2.0 pistons were not, and are often called flat-topped. The 2.0 Bus pistons had a larger dish. --DD How do I tell the difference? Is there a diameter to the dish that I can measure? |
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| SLITS |
Dec 24 2012, 11:07 AM
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#7
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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  |
QUOTE(KaptKaos @ Dec 24 2012, 08:52 AM) QUOTE(Dave_Darling @ Dec 24 2012, 06:04 AM) US 2.0 pistons were dished. The original Euro-spec 2.0 pistons were also dished, but had a different (smaller) dish. Later European-spec 2.0 pistons were not, and are often called flat-topped. The 2.0 Bus pistons had a larger dish. --DD How do I tell the difference? Is there a diameter to the dish that I can measure? Not diameter, it's the cc of the dish. Maybe I can find images later. Regardless, from what I can find the 914 had a 7 cc dish and the bus had a 12 cc dish. What they failed to mention is that 2.0L Bus heads have 4 intake mounting studs, just like the 1.7/1.8 and carry part number 022 101 372G. 2.0L 914 heads carry part number 039 101 371A. |
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