Modify SU Manifold for 4 barrel.

[sidecar]

Hi
I would fill in the cap down the middle between the runners and at either end, you don't want fuel collecting in that void under the runners!

According to a guy on the Cobra forum the void between the runners is actually full of coolant so I guess the mixing of the inlet charge and the coolant should be avoided!

[kiwicar]

Hi
I would fill in the cap down the middle between the runners and at either end, you don't want fuel collecting in that void under the runners!

According to a guy on the Cobra forum the void between the runners is actually full of coolant so I guess the mixing of the inlet charge and the coolant should be avoided!

you may have a point there. . . . I forget people have water in their engines
best regards
Mike

[Dixie6789]

Thanks Mike.

Was going to cut all you see in the photos out and weld in a new plate and polish and blend in. There is a small 3mm hole that the water jacket obviously used to warm the carb up? Will weld it up.

I am no expert by any stretch of the imagination, but it doesn't look difficult to me. Plus the location of the temp gauge sender seems to be in a better position and wont suffer the "dead" spot and require the mod of drilling 2 x holes to stop it showing over heating that the 360 performer does.

M

[sidecar]

Thanks Mike.

Was going to cut all you see in the photos out and weld in a new plate and polish and blend in. There is a small 3mm hole that the water jacket obviously used to warm the carb up? Will weld it up.

I am no expert by any stretch of the imagination, but it doesn't look difficult to me. Plus the location of the temp gauge sender seems to be in a better position and wont suffer the "dead" spot and require the mod of drilling 2 x holes to stop it showing over heating that the 360 performer does.

M

The "Performer" is a 180 manifold not a 360. You are right in that the Performer does quite often require the drilling mod but its a small price to pay for then being able to run a very good manifold. Your manifold will end up being a low rise manifold yet the carb will be quite high which negates the ONLY advantage of a low rise manifold.

[Dixie6789]

Pete.

Will probably end up using my 360 off the current motor.
I wanted to make a manifold to bolt back on so as not to leave a half done motor.

[mr-scott]

Mark,

Looking at what you have done to the Rover manifold (photos posted) so far it would appear that you have a lot of machining work to do still. To do the job properly you have to mill (on a milling Machine or CNC VMC as I used) out the rectangular ports going down into the lower manifold until you have them in line with the inlet runners which cross over to each side diagonally being careful not to break through the runner walls, this will open up sufficient to make the best use of a 4 barrel. I finished mine off by hand porting and gas flowing the manifold where I could not get to with the CNC and a divider plate to keep it a true dual plane manifold, on some manifolds as others have said there can be a small water passage hole that needs blanking off. The end result can be worth it I was running rejetted/needled HIF44 SU' with roller bearing tops, knife edged butterflys, flowed bodies, full radius ram-pipes, large K&Ns (basically all the Vizard type mods you can do to get as much out of the SU's) I bolted on my modified Rover manifold with an Edelbrock 1404 500 cfm, set it up with jets and metering rods, took it to the drag strip and knocked 1.2 seconds of my previous quarter mile time with the same engine running the well sorted SU's

[Dixie6789]

Thanks for this info. I intend taking it to a local firm to do the machining,

I brought a ali plate of Ebay to weld in place to make dual plane.

I am lucky enough to have a 360 performer available, so if it doesn't work, I can use this.

Do you have any photos of what you did?

thanks M

[sidecar]

Thanks for this info. I intend taking it to a local firm to do the machining,

I brought a ali plate of Ebay to weld in place to make dual plane.

I am lucky enough to have a 360 performer available, so if it doesn't work, I can use this.

Do you have any photos of what you did?

thanks M

Edelbrock don't make a 360 manifold for a Rover engine, its a 180.

[Dixie6789]

My manifold has "Performer 3.51" written on it? so is it any good Pete?

Thanks for this info. I intend taking it to a local firm to do the machining,

I brought a ali plate of Ebay to weld in place to make dual plane.

I am lucky enough to have a 360 performer available, so if it doesn't work, I can use this.

Do you have any photos of what you did?

thanks M

Edelbrock don't make a 360 manifold for a Rover engine, its a 180. [/quote]

[sidecar]

My manifold has "Performer 3.51" written on it? so is it any good Pete?

Thanks for this info. I intend taking it to a local firm to do the machining,

I brought a ali plate of Ebay to weld in place to make dual plane.

I am lucky enough to have a 360 performer available, so if it doesn't work, I can use this.

Do you have any photos of what you did?

thanks M

Edelbrock don't make a 360 manifold for a Rover engine, its a 180.

[/quote]


Yes its a very good manifold, its a dual plane manifold which are sometimes called a 180 manifold

[Dixie6789]

Finished the conversion of the SU manifold for use on a 4 barrel.

What do you guys think? increased the depth buy 2" to create a small plenum and put a dividing plate in place to help throttle response etc.

What do you experts think?

http://s740.photobucket.com/user/markdi ... m.jpg.html

http://s740.photobucket.com/user/markdi ... t.jpg.html

http://s740.photobucket.com/user/markdi ... r.jpg.html

http://s740.photobucket.com/user/markdi ... c.jpg.html


Mark

[kiwicar]

Hi
Nice work did you test the engine with SUs on so you had a comparison?
best regards
Mike

[Dixie6789]

No I didn't. Only brought the manifold as a template because I was skimming the heads and decking the block, so wanted to make sure it fitted when I took 38 thou off the inlet faces.

Sat looking at it and to my very low knowledge base it seemed a reasonable manifold, plus a few of the rodders around my area have said the conversion works well. Only wanted to do it because "It was there". Might put it on ebay.

Always got my Eddie Performer 180 if it doesn't work.

Mark

[kiwicar]

Hi Mark
as I said it looks a nice job, if it were me I would not be able to resist trying it having put all the work in. Basing it on the 2" spacer it should give the mixture plenty of room to turn to enter the runners. . .
Best regards
Mike

[Dixie6789]

Not going to hurt anything giving it a go, just the waste of a inlet manifold.

It is 30mm higher than my performer manifold, so will just fit under the bonnet, but can't use my nice Cobra air filter.