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Old 02-11-2003, 05:33 PM   #1
KooK
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Default 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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Old 02-11-2003, 05:52 PM   #2
Zola
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DOHC, 4 valves per cylinder

Bore/Stroke: 92mm x 75mm

http://www.subaru.net/usproduct/2002/wrx/02wrxspecs.htm
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Old 02-11-2003, 07:08 PM   #3
KooK
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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.
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Old 02-11-2003, 07:43 PM   #4
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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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Old 02-11-2003, 08:04 PM   #5
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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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Old 02-11-2003, 08:17 PM   #6
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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
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Old 02-11-2003, 08:56 PM   #7
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Quote:
Originally posted by Cabal
What Volkswagens and MY use flat fours? I was under the impression that all their recent engines were inlines. Older ones?
He's got an old air cooled one. Those things are neat-o.

BTW, cool screen name, KooK!
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Old 02-11-2003, 10:13 PM   #8
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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!
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Old 02-12-2003, 07:36 PM   #9
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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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Old 02-12-2003, 08:16 PM   #10
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They're pushrod engines. Do I have pictures of the Baja he says...

http://www.volks-tech.com/mybb.html

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Old 11-15-2007, 12:58 PM   #11
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Default Just to clarify .....

Quote:
Originally Posted by HondaH8er View Post
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?
OHV means the valves (both of them) are positioned over the combustion chamber, on the cylinder head. The designation has nothing to do with camshaft location. They can either be overhead cam (OHC), dual overhead cam (DOHC) or cam in block (pushrod).

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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Old 11-15-2007, 01:16 PM   #12
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Quote:
Originally Posted by Stevethefolkie View Post
OHV means the valves (both of them) are positioned over the combustion chamber, on the cylinder head. The designation has nothing to do with camshaft location. They can either be overhead cam (OHC), dual overhead cam (DOHC) or cam in block (pushrod).
I have no idea why you decided to post in this 4 year old thread.

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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Old 11-15-2007, 01:40 PM   #13
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^^i was wondering how a 32000 member number wouldnt know this by now......
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Old 11-15-2007, 02:23 PM   #14
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The OP is about the same vintage as a flat four VW.
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Old 11-15-2007, 02:35 PM   #15
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Quote:
Originally Posted by Stevethefolkie View Post

They are overhead valve and pushrod - Pushrod engines typically use a timing chain or timing gears to drive the camshaft at twice crank speed.

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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Old 11-15-2007, 02:38 PM   #16
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oldest thread ever
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