Inline 4 cylinder comp motor - Page 2

SIX GUN · 05-24-2010, 12:47 AM

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

Larry Fulton · 06-25-2010, 08:45 PM

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!

Tony Curcio · 06-28-2010, 06:51 PM

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.

Tom Simon · 09-10-2010, 07:29 PM

Quote:

Originally Posted by Bench Racer

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.

Mountainmotorman · 10-29-2010, 12:39 AM

Ask Aragona and you will know what it takes and what the issues are. LOL

Tom P · 05-28-2011, 11:06 PM

The 4 banger VW Bug's around here use much bigger Webers, 58mm i think.

norm saibene · 06-02-2011, 07:29 PM

they are 55mm on top and 45 mm on the bottom there only one guy that can get them to run on a 4cyl

Curtis Boggs · 07-22-2011, 02:26 PM

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

Curtis

Axis Racing · 10-20-2011, 12:38 PM

Hey Curtis,

How big is Greco's 4-cylinder in L/AA?

david ring · 10-25-2011, 08:13 PM

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

05-24-2010, 12:47 AM	#11
SIX GUN Junior Member Join Date: May 2010 Location: LORAIN OH Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	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 __________________ DESTROKED 300 (272ci) Last edited by SIX GUN; 05-24-2010 at 12:50 AM.

06-25-2010, 08:45 PM	#12
Larry Fulton Member Join Date: Oct 2003 Posts: 270 Likes: 52 Liked 0 Times in 0 Posts	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! __________________ Larry Fulton

06-28-2010, 06:51 PM	#13
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	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. __________________ Tony Curcio 1860 STK

10-29-2010, 12:39 AM	#15
Mountainmotorman Junior Member Join Date: Dec 2009 Location: New Jersey Posts: 33 Likes: 0 Liked 0 Times in 0 Posts	Re: Inline 4 cylinder comp motor Ask Aragona and you will know what it takes and what the issues are. LOL __________________ _

05-28-2011, 11:06 PM	#16
Tom P Senior Member Join Date: Mar 2002 Posts: 707 Likes: 30 Liked 240 Times in 94 Posts	Re: Inline 4 cylinder comp motor The 4 banger VW Bug's around here use much bigger Webers, 58mm i think.

06-02-2011, 07:29 PM	#17
norm saibene Junior Member Join Date: Oct 2010 Posts: 44 Likes: 0 Liked 0 Times in 0 Posts	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

07-22-2011, 02:26 PM	#18
Curtis Boggs Junior Member Join Date: Aug 2004 Location: Lorton, VA Posts: 1 Likes: 0 Liked 0 Times in 0 Posts	Re: Inline 4 cylinder comp motor How about talking to Jake or Brett at Jenkins, .. aren't they responsible for Greco's 4 banger? Curtis __________________ Race Flow Development . com

10-20-2011, 12:38 PM	#19
Axis Racing Junior Member Join Date: Oct 2011 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Inline 4 cylinder comp motor Hey Curtis, How big is Greco's 4-cylinder in L/AA?

10-25-2011, 08:13 PM	#20
david ring Senior Member Join Date: Feb 2003 Location: Oneonta.,NY Posts: 889 Likes: 0 Liked 0 Times in 0 Posts	Re: Inline 4 cylinder comp motor I think around 200 cubes-it is a specially built block.