Merlin Heads

CastleMGBV8 · Post by **CastleMGBV8** » Fri Oct 09, 2009 7:37 pm

Perry,

Thats good news, was this a without gas run or did you try it with the gas as well?

Kevin.

ged · Post by **ged** » Fri Oct 09, 2009 7:41 pm

Hi Perry,

What rev's were you doing for the 25hp increase?

Regards Ged

mgbv8 · Post by **mgbv8** » Fri Oct 09, 2009 7:59 pm

Kev!!
The increase was nasp without gas.

Ged!
Max rpm for this test was about 5500....

I've detailed my results in the Dyno section.

I was happy with the result, but I fried my tyres on nitrous

kokkolanpoika · Post by **kokkolanpoika** » Fri Oct 09, 2009 9:43 pm

mgbv8 wrote:I just fitted a Weber 600cfm carb and a Harcourt single plane manifold to my 4.6.

My old setup was a Weber 500cfm carb and edelbrock performer 3.51 manifold.

I had to fiddle with jets to get AFR's correct at wide open throttle. But she made 25bhp more at wide open throttle on the dyno today with the new carb and manifold.

I reckon this will be a good upgrade to help MinorV8 get his power up.

So are you running ported rover heads? stage 3?

My theory. If minorV8 buts single plane manifold with his engine, he might get also same power upgrade with his old setup/rover heads? So total ingrease might be same 11hp?

mgbv8 · Post by **mgbv8** » Fri Oct 09, 2009 9:52 pm

Timo!!

My heads are stock 4.6 with stock valves. But I have ported the exhausts myself to JE specs.

minorv8 · Post by **minorv8** » Tue Oct 13, 2009 5:27 am

Well, the heads have been fitted regardless of whether they have been waste of time. I can always assemble a spare engine using the leftover bits knowing that it will perform quite well.

Perry, that was good news and may infact confirm what I suspected. If only the winter would come late this year... then I would have an opportunity to test the manifold before doing anything else to the engine.

minorv8 · Post by **minorv8** » Wed Nov 18, 2009 12:13 pm

Update, with Willpower manifold + 20 hp over Edelbrock, but the low end torque suffered as expected. I only swapped the manifold and ran it on rollers as is, no tuning whatsoever.

mgbloke · Post by **mgbloke** » Wed Dec 09, 2009 8:44 pm

Anyone want some.
http://cgi.ebay.co.uk/Rover-V8-Merlin-F ... 27adaf2f1f

Bit more expensive than real Steel.

mgbv8 · Post by **mgbv8** » Wed Dec 09, 2009 9:24 pm

I thought the Merlin things were Real Steels own heads??

I was happy to see a 25bhp increase with just a bigger carb and the Harcourt manifold on my standard (but home ported) 4.6 heads.
I made 395hp with gas on this setup.

I have modified my fuel and nitrous pipes now and I have proved the increased flow will give me another 60hp of gas and fuel on the original jets. If I add this to the extra 25hp nasp I reckon I will be in with a shot at making a flat 10 second pass next year.

chodjinn · Post by **chodjinn** » Wed Dec 09, 2009 9:45 pm

Whoa, Perry that's wicked!!!

mgbv8 · Post by **mgbv8** » Wed Dec 09, 2009 10:02 pm

Ollie!
I'm hoping to hit 450hp with gas on the stock engine next year!!
Thats my engine goal. My 1/4 mile goal is 10 seconds or better!!

CastleMGBV8 · Post by **CastleMGBV8** » Wed Dec 09, 2009 11:04 pm

So What are RPI charging an additional 50% for, over Real Steels price!!!!!

Kevin.

kiwicar · Post by **kiwicar** » Thu Dec 10, 2009 10:22 am

"So What are RPI charging an additional 50% for, over Real Steels price!!!!! "
Because they are RPI and that is what they do

Mike

Post by **katanaman** » Thu Dec 10, 2009 6:15 pm

What the hell is cast billet alloy? its either cast or its billet, good old RPI never fail with the bull

Post by **Coops** » Thu Dec 10, 2009 6:33 pm

wonder what RS would say about that advert