Single plane manifolds

minorv8 · Post by **minorv8** » Sat Sep 12, 2009 6:13 am

Does anyone know where to get single plane manifold nowadays ?

topcatcustom · Post by **topcatcustom** » Sat Sep 12, 2009 10:15 am

V8 tuner/real steel will probably supply you with the common offy 360, but it is a low riser and not the best. If you need it to be low for under bonnet clearance then sorted, if your after something rarer or old then maybe just keep your eyes peeled on ebay, UK or US.

TC

mgbv8 · Post by **mgbv8** » Sat Sep 12, 2009 10:38 am

John Eales stocks these.

mgbv8 · Post by **mgbv8** » Sat Sep 12, 2009 10:40 am

crayefish · Post by **crayefish** » Sat Sep 12, 2009 11:16 am

If only they made a Victor Jr. manifold for the Rover......

HairbearTE · Post by **HairbearTE** » Sat Sep 12, 2009 6:58 pm

crayefish wrote:If only they made a Victor Jr. manifold for the Rover......

If they did it would look exactly the same as the above picture! I got mine from Wildcat, it's a Harcourt inlet with wildcat stamped on it. The other option is to wait around for a huffaker to turn up on ebay however many of them have been over ported and/or drilled for nitrous nozzles. A post by Gregg55 on here a while back included data that shows the harcourt inlet to be superior anyway.

crayefish · Post by **crayefish** » Sat Sep 12, 2009 11:02 pm

HairbearTE wrote:
crayefish wrote:If only they made a Victor Jr. manifold for the Rover......
If they did it would look exactly the same as the above picture! I got mine from Wildcat, it's a Harcourt inlet with wildcat stamped on it. The other option is to wait around for a huffaker to turn up on ebay however many of them have been over ported and/or drilled for nitrous nozzles. A post by Gregg55 on here a while back included data that shows the harcourt inlet to be superior anyway.

From what I remember, Vicotr Jrs are much taller.... they are at the extreme end of the single planes....

CastleMGBV8 · Post by **CastleMGBV8** » Sun Sep 13, 2009 12:16 am

You can always add a spacer if you wan't a high rise.

Kevin.

crayefish · Post by **crayefish** » Sun Sep 13, 2009 10:22 am

Cant beat this though! (Victor Senior)

http://www.summitracing.com/parts/EDL-2 ... mage=large

HairbearTE · Post by **HairbearTE** » Sun Sep 13, 2009 12:58 pm

The design of the Inlet ports in the head are the main reason the rover version isnt very tall. Making the inlet taller would create an undesirable abrupt turn in the inlet tract. Spacers are interesting and I have some to experiment with. A really tall single plane inlet is the "funnel web" that is available for the SBF. It looks like an awesome piece and by all accounts performs very well too.

minorv8 · Post by **minorv8** » Sun Sep 13, 2009 6:10 pm

I have currently the Performer manifold but I am slightly sceptical whether it has enough flow capacity past 5500 rpm. Edelbrock designed it for 3,5 litre engine with idle to 5500 range. I am running a 4,6 litre engine and shift at 6300 rpm at 1/4 mile. The peak hp at rollers is at 5600 rpm.

Now that I have the Merlins fitted the issue is more than interesting...

sidecar · Post by **sidecar** » Sun Sep 13, 2009 6:28 pm

minorv8 wrote:I have currently the Performer manifold but I am slightly sceptical whether it has enough flow capacity past 5500 rpm. Edelbrock designed it for 3,5 litre engine with idle to 5500 range. I am running a 4,6 litre engine and shift at 6300 rpm at 1/4 mile. The peak hp at rollers is at 5600 rpm.

Now that I have the Merlins fitted the issue is more than interesting...

The size of the runners in the eddy 180 are suited to the standard ports in the RV8 heads, If your heads have bigger ports then the manifold will need to be port-matched.

If your old heads had the standard size valves in them then your 4.6 was never going to be able to rev very high!

crayefish · Post by **crayefish** » Sun Sep 13, 2009 6:33 pm

minorv8 wrote:I have currently the Performer manifold but I am slightly sceptical whether it has enough flow capacity past 5500 rpm. Edelbrock designed it for 3,5 litre engine with idle to 5500 range. I am running a 4,6 litre engine and shift at 6300 rpm at 1/4 mile. The peak hp at rollers is at 5600 rpm.

Now that I have the Merlins fitted the issue is more than interesting...

Do they make the Performer RPM for the Rover? That would shift up the power band of the manifold by about 1000. It seems to be a very popular manifold for the sbc. Also the airgap ones too as they run a bit cooler.

Perhaps its possible to 'convert' a Performer to a Performer RPM.... as far as I can tell from photos, the main difference is that there is a hole in the divider between the two halfs.... hard to explain but you can see in these photos.

http://www.summitracing.com/parts/EDL-7 ... mage=large

http://www.summitracing.com/parts/EDL-2101/?image=large

Kinda makes it a cross between a single and dual plane.... However the same could be achieved with an open spacer (which is cheap!).... try that first perhaps?

CastleMGBV8 · Post by **CastleMGBV8** » Sun Sep 13, 2009 9:36 pm

The other very main difference is that it is unheated, but I would be interested to hear how much difference a 1/2" spacer made.

The Harcourt will probably do a better job.

Kevin.

minorv8 · Post by **minorv8** » Mon Sep 14, 2009 4:24 am

The size of the runners in the eddy 180 are suited to the standard ports in the RV8 heads, If your heads have bigger ports then the manifold will need to be port-matched.

If your old heads had the standard size valves in them then your 4.6 was never going to be able to rev very high!

The ports and valves were bigger, the manifold was port matched. I have run with 1" spacer.