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Old 05-24-2010, 12:47 AM   #11
SIX GUN
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Default Re: Inline 4 cylinder comp motor

Intakes with plenums required very shallow floors and a lot of work to make power,.[/QUOTE]

I run an Inline 6, and I'm trying an old Holman/Moody singel 4 .... Should I try to raise the floor of the plenum ???The engine is a destroked 300 (272ci) Ford
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Old 06-25-2010, 08:45 PM   #12
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Default Re: Inline 4 comp motor - Quad 4?

Not trying to steal this thread, but years ago I was told that the Olds Quad-4 motors were not legal in Comp. Eliminator...

Can anybody explain why not??

Thanks!
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Old 06-28-2010, 06:51 PM   #13
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Default Re: Inline 4 cylinder comp motor

I'm going to guess it was because it had 4 valves per cylinder, and the rules didn't provide for them when the Quad Four first came out

Today, 4-valve engines are allowed in L/A and F/D with a weight penalty. They are still not allowed in F/ED.
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Old 09-10-2010, 07:29 PM   #14
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Default Re: Inline 4 cylinder comp motor

Quote:
Originally Posted by Bench Racer View Post
I am sure the inline 4's are a different animal than the aircooled VW's but the standard for the vw drag engines is the 48 ida's. with IR induction. There are several different performance manifolds options for the Bug engine that utilize a single carb ranging from a 2bbl, or a 4bbl setup. The single carb performance setup on a bug is normally only seen on a mild street car or in a racing class where rules call for stock carburation. I know a lot of the trends in car performance is spread by the monkey see monkey do thing, but when it comes to the quickest n/a aircooled VW's it will have 48 IDA's and IR manifolds. Don Jackson
That's true, the norm in the flat-4 world is ubiquitous Weber 48IDA (and derivatives there of) I have a 146cu in flat-4 2-valve VW (with IR) that makes >2hp/cu in. Not bad for an antique 2 valve motor conceived in the 1930's with 11" pushrods!

But the debate in the VW world isn't a clean one either, I know of two racers who have experimented with a common plenum on a NA flat 4 similar to mine, he claims to have found more bottom end torque. The went moot, when the organization outlawed plenum manifolds in the normally aspirated heads-up classes, pretty much halting further development.

ProStock bike? IR

Another point of reference is the NA or 'All Motor' Honda guys that raced in NHRA's (now defunct) Sport Compact Series. Whaen I raced with those guys, I mostly saw (if not every one) individual runner intakes on the All Motor inline 4 cylinders.
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Old 10-29-2010, 12:39 AM   #15
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Default Re: Inline 4 cylinder comp motor

Ask Aragona and you will know what it takes and what the issues are. LOL
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Old 05-28-2011, 11:06 PM   #16
Tom P
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Default Re: Inline 4 cylinder comp motor

The 4 banger VW Bug's around here use much bigger Webers, 58mm i think.
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Old 06-02-2011, 07:29 PM   #17
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Default Re: Inline 4 cylinder comp motor

they are 55mm on top and 45 mm on the bottom there only one guy that can get them to run on a 4cyl
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Old 07-22-2011, 02:26 PM   #18
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Default Re: Inline 4 cylinder comp motor

How about talking to Jake or Brett at Jenkins, .. aren't they responsible for Greco's 4 banger?

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Old 10-20-2011, 12:38 PM   #19
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Default Re: Inline 4 cylinder comp motor

Hey Curtis,

How big is Greco's 4-cylinder in L/AA?
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Old 10-25-2011, 08:13 PM   #20
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Default Re: Inline 4 cylinder comp motor

I think around 200 cubes-it is a specially built block.
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