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02-11-2003, 04:33 PM | #1 |
Scooby Newbie
Member#: 32774
Join Date: Feb 2003
Location: Des Moines, Iowa
Vehicle:59 VW Beetle Orange |
Flat Four questions.
Ok, so the Subaru WRX has a flat four engine they tell me.
I'm wondering if it has 1, 2 or 4 camshafts. Whats the bore and stroke of these engines? I'm going to assume they have 4 valves per cylinder? Does anybody have a layout of this engine?? Thanks in advance!
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02-11-2003, 04:52 PM | #2 |
Scooby Specialist
Member#: 16876
Join Date: Mar 2002
Chapter/Region:
MWSOC
Location: St Paul, MN
Vehicle:2002 Impreza WRX WR Blue |
DOHC, 4 valves per cylinder
Bore/Stroke: 92mm x 75mm http://www.subaru.net/usproduct/2002/wrx/02wrxspecs.htm |
02-11-2003, 06:08 PM | #3 |
Scooby Newbie
Member#: 32774
Join Date: Feb 2003
Location: Des Moines, Iowa
Vehicle:59 VW Beetle Orange |
Awesome, thanks!
One last thing I'm not quite catching on because its hard to believe. So, DOHC. With this engine it should be 2 heads correct? Thus making it 4 camshafts? Its just hard for me to believe because my Volkswagens are Flat Fours and they have a single cam. |
02-11-2003, 06:43 PM | #4 |
Scooby Specialist
Member#: 3097
Join Date: Nov 2000
Chapter/Region:
NWIC
Location: www.rs25.com Beaverton, OR
Vehicle:2013 Ford Focus ST Performance Blue |
Were the Volkwagons overhead valves or did they use pushrods? A pushrod V8 only has 1 cam that works the valves on both heads via the pushrods and rocker arms, but the Subarus are overhead cams, meaning the WRX DOHC engine does indead have 4 camshafts, 2 per cylinder head. My 00 2.5RS is a SOHC, with one cam on each head, making for 2 total camshafts.
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02-11-2003, 07:04 PM | #5 |
Scooby Specialist
Member#: 31159
Join Date: Dec 2002
Chapter/Region:
TXIC
Location: Austin, TX
Vehicle:2006 WRX, 2008 2.5i San Remo Red |
What Volkswagens and MY use flat fours? I was under the impression that all their recent engines were inlines. Older ones?
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02-11-2003, 07:17 PM | #6 |
Scooby Specialist
Member#: 13110
Join Date: Dec 2001
Chapter/Region:
NESIC
Location: Rhode Island
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What vintage is your VW?
Recent VWs are either inline 4, the "pseudoV" VR6, a shared with Audi V6, or those weird "Ws". (at least if we are just talking about the US market) For some interesting readings, go to Autozine site http://autozine.kyul.net/technical_s...tech_index.htm |
02-11-2003, 07:56 PM | #7 | |
Scooby Guru
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Join Date: Jun 2001
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BAIC
Location: Gold Country
Vehicle:2023 MAGA Hat Model3 grey, or is it gray? |
Quote:
BTW, cool screen name, KooK! |
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02-11-2003, 09:13 PM | #8 |
Scooby Newbie
Member#: 32774
Join Date: Feb 2003
Location: Des Moines, Iowa
Vehicle:59 VW Beetle Orange |
Hahaha, thanks stanley
Heres my VW engines by my Integra. GOOD LORD I miss that car. The one on the right is dirty because I never fully cleaned it off after I offroaded this one time, the one of the left is going back onto the baja (what I offroad). Just built the one on the Left (1904) and the one on the right really is my street engine (2110) So yes, we're talking old school here. I can swap engines in my Baja faster then you guys can change spark plugs! |
02-12-2003, 06:36 PM | #9 |
Scooby Specialist
Member#: 3097
Join Date: Nov 2000
Chapter/Region:
NWIC
Location: www.rs25.com Beaverton, OR
Vehicle:2013 Ford Focus ST Performance Blue |
Sweet! Got any pics of the Baja? I've always wanted a Bug, just haven't gotten one yet. But I don't know a lot about those old air-cooled flat-4's, are they over head valve, or are they pushrod?
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02-12-2003, 07:16 PM | #10 |
Scooby Newbie
Member#: 32774
Join Date: Feb 2003
Location: Des Moines, Iowa
Vehicle:59 VW Beetle Orange |
They're pushrod engines. Do I have pictures of the Baja he says...
http://www.volks-tech.com/mybb.html |
11-15-2007, 11:58 AM | #11 | |
Scooby Newbie
Member#: 163491
Join Date: Nov 2007
Location: Central Pennsylvania
Vehicle:1991 Loyale Grey |
Just to clarify .....
Quote:
They are overhead valve and pushrod - Pushrod engines typically use a timing chain or timing gears to drive the camshaft at twice crank speed. OHC or DOHC configurations use either timing chains or timing belts (or, in the case of 16V VW's a combination of the two) to drive the cams at twice crankshaft speed. Flathead engines have the valves in pockets off to the sides of the combusition chambers - they typically have pushrods. Again, chains or, more common, gears drive the camshaft at twice crank speed. then you can get (and we're going way back) to I over E configurations (early harley davidson motorcycles amongst others) where the inlet valve is (you guessed it) over the exhaust valve - many of these engines have exposed valve gear (the top of the pushrod, the rocker and the top of the valve stem and valve spring) - which are lubed externally. This configuration is a major reason behind the tradition of bikers wearing black leather chaps or pants - the oil would blow off and make a mess of your pants. |
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11-15-2007, 12:16 PM | #12 | |
Scooby Specialist
Member#: 30907
Join Date: Dec 2002
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SWIC
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Vehicle:SWP GDB-G |
Quote:
Although I am going to have to disagree with you on one point....the "OHV" designation is commonly used to refer to vehicles that are not OHC...It doesn't matter that the valves are over the chamber in both systems or not. |
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11-15-2007, 12:40 PM | #13 |
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^^i was wondering how a 32000 member number wouldnt know this by now......
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11-15-2007, 01:23 PM | #14 |
Scooby Specialist
Member#: 89628
Join Date: Jun 2005
Location: Hawaii, Oahu
Vehicle:'02 Wagon VF39'd & Quick Racked |
The OP is about the same vintage as a flat four VW.
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11-15-2007, 01:35 PM | #15 | |
Former Vendor
Member#: 139767
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Seattle, WA (Green Lake)
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Quote:
that's a big negatory there partner. Try HALF crank speed. Just wanted to bump the old ass thread with little point! post whoring the vendor account ftw -Dominic |
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11-15-2007, 01:38 PM | #16 |
Scooby Specialist
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South East
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oldest thread ever
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