Street Demon 625CFM

ghw70mgv8 · Post by **ghw70mgv8** » Tue Jul 01, 2014 5:24 am

Has anyone seen or had any experience with these carbies?

Stright up 625 CFM seems a little large for a 4.6 Rover but with the secondary "ari valve control" it might to the trick.

https://www.demoncarbs.com/1901.asp

Looks like a reincarnated quadrajet!

What are the thoughts of this on a mildly worked 4.6?

Cheers Graeme[/url]

mgbv8 · Post by **mgbv8** » Wed Jul 02, 2014 7:06 pm

Looks like a tidy version of the Edelbrock series ie Weber 500 type.

Robrover · Post by **Robrover** » Thu Jul 03, 2014 9:26 am

Used quite a bit here on V8 Holdens. Some guys have had trouble tuning Demons and prefer Holley or Quickfuel carbs

http://www.gmh-torana.com.au/forums/top ... -or-demon/

Check out the Aussie V8 forums too.

Blown v8 · Post by **Blown v8** » Thu Jul 03, 2014 12:22 pm

I ran a 650 Demon carb for a couple of years on my supercharged Rover,
Had no trouble with it.Gone with a QFT carb now,better quality IMHO
Have got a SA Design tuning Demon book if anybody needs more info !

ghw70mgv8 · Post by **ghw70mgv8** » Fri Jul 04, 2014 11:57 am

Thanks Robrover, I will check out that link, I am very interested in the smallest QFT and BLP carbs

Blown V8, originally I had a Holley 650 DP street HP but just couldn't get the mixtures right for part throttle running. I didn't have an A/F meter installed (which I am rectifying now) but I would have hated to see the numbers. I was advised to put this carb on by the tuner who was working on the car. Since I have had issues with the engine, despite being nearly new, I have had many people from all quarters say that that carb is simply too big for a pretty well modified (but not full race) 4.6.

So I am looking for another carb but am nervous to go with anything up at that 650 rating. But then again it is very difficult to find a 4150 based carb with all the good bits on it under a 650 rating - like the QFT SS-Series 650 mech sec with annular boosters.

The only reason I am looking at the this carb (despite the large-ish rating) is the "secondary air value" to control the amount of air (and fuel) that goes in the secondaries.

Anyway that's my story in a nutshell, Cheers, Graeme

mgbv8 · Post by **mgbv8** » Fri Jul 04, 2014 10:04 pm

ghw70mgv8 wrote:Thanks Robrover, I will check out that link, I am very interested in the smallest QFT and BLP carbs

Blown V8, originally I had a Holley 650 DP street HP but just couldn't get the mixtures right for part throttle running. I didn't have an A/F meter installed (which I am rectifying now) but I would have hated to see the numbers. I was advised to put this carb on by the tuner who was working on the car. Since I have had issues with the engine, despite being nearly new, I have had many people from all quarters say that that carb is simply too big for a pretty well modified (but not full race) 4.6.

So I am looking for another carb but am nervous to go with anything up at that 650 rating. But then again it is very difficult to find a 4150 based carb with all the good bits on it under a 650 rating - like the QFT SS-Series 650 mech sec with annular boosters.

The only reason I am looking at the this carb (despite the large-ish rating) is the "secondary air value" to control the amount of air (and fuel) that goes in the secondaries.

Anyway that's my story in a nutshell, Cheers, Graeme

So this is for a road car then??
The 650 size is great for drag cars especially with boost and or nitrous. But for a road car I think a 650 carb is too big for decent econmomy and part throttle response on a 4.6 engine.

ghw70mgv8 · Post by **ghw70mgv8** » Sat Jul 05, 2014 12:25 pm

Yes Perry a road car that sees some spirited drives through the hills and 4 or 5 track days a year.

So pretty much the best option is an Edelbrock 500 then?? Are there any other more performance orientated carbs without stepping up to 650 CFM??

Cheers, Graeme.