BHP figures for 5.0 RV8

leylandracer · Post by **leylandracer** » Fri Jul 13, 2007 6:45 pm

Power graphs fron the dynp run. A bit rich

Bus that on quad 48's so maybe the best i can hope for. a bit

how the power tails off at the top end

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leylandracer · Post by **leylandracer** » Fri Jul 13, 2007 6:46 pm

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leylandracer · Post by **leylandracer** » Wed Aug 29, 2007 9:16 am

Just wondering what you guys think with the AFR readings

The rolling road operator said safe but a tad rich

What do you think to rich

or OK ish

Remember its running quad Weber 48 DCO-SP's, just have the feeling that i should have gone for 45's

It goes OK though

Steve

Eliot · Post by **Eliot** » Wed Aug 29, 2007 10:08 am

thats the sort of AFR's i run at 7psi boost. I would think 13's would be better for n/a, you would probably gain a few BHP.
If youre happy with it, leave it alone and enjoy it for a while.

5000SE · Post by **5000SE** » Thu Aug 30, 2007 11:00 am

I'd have expected a bit more from the engine spec you have.

Whose heads are they, and what are the valve sizes? Stage 4 to one man is stage 3 to another.

I've seen 314bhp at 5050rpm, 367ftlb from a 4.6 with stage 3 heads and a milder cam running a twin plenum top end with twin flapper airflowmeters.

With 5.0, Stage 4, 404 and big quads I'd hope for 340-350 bhp.

v8 jago · Post by **v8 jago** » Tue Sep 04, 2007 7:56 pm

I think that is ok . I have similar engine with 13.1 cr a huffacer inlet a 650cmf, 256 cam (power from 3400 to 7400rpm) group A rockers, stage 4 ultimate big valve haeds, msd ignition system. I have been told to be expecting about 340-360bhp. I dont know if that is what it produces as ive never had it on a dyno, But it can do 11.6sec 1/4s I am thinking of trying a 1050 dominator and concidering selling my heads and getting some wildcat heads.

v8 jago · Post by **v8 jago** » Tue Sep 04, 2007 7:57 pm

I think that is ok . I have similar engine with 13.1 cr a huffacer inlet a 650cmf, 256 cam (power from 3400 to 7400rpm) group A rockers, stage 4 ultimate big valve haeds, msd ignition system. I have been told to be expecting about 340-360bhp. I dont know if that is what it produces as ive never had it on a dyno, But it can do 11.6sec 1/4s I am thinking of trying a 1050 dominator and concidering selling my heads and getting some wildcat heads.

v8 jago · Post by **v8 jago** » Tue Sep 04, 2007 7:58 pm

Looks like i might say that twice then

HairbearTE · Post by **HairbearTE** » Tue Sep 04, 2007 10:51 pm

I doubt very much whether you will be able to pull air through a 1050 fast enough with a rover engine to get good atomisation, and fuel distribution might be poor as well. Admittedly I'm using a 1000cfm T/B in my build, but the inlet tracts themselves are in proportion to my engines needs and i'm injecting at the ports. Why not try to find a 750cfm version of the 4500 series carb that holley made a while back specifically for guys who wanted to run a Dominator on a small block? I'm sure if you keep an eye on U.S. ebay one will turn up soon enough at the right price.

HairbearTE · Post by **HairbearTE** » Tue Sep 04, 2007 11:27 pm

Jago check this out! 750 Dominator complete with 4500 adapter spacer! Just the ticket

http://cgi.ebay.com/ebaymotors/750-Holl ... enameZWDVW

v8 jago · Post by **v8 jago** » Wed Sep 05, 2007 1:58 am

Thanks for that !! Im on to it.

mgbloke · Post by **mgbloke** » Thu Sep 13, 2007 10:09 pm

As a matter of interest what gearbox and axle are you using.
You seem to have minimal transmission losses of about 40hp which I think is very good.

Mark

leylandracer · Post by **leylandracer** » Mon Sep 17, 2007 7:15 pm

5000SE wrote:I'd have expected a bit more from the engine spec you have.

Whose heads are they, and what are the valve sizes? Stage 4 to one man is stage 3 to another.

I've seen 314bhp at 5050rpm, 367ftlb from a 4.6 with stage 3 heads and a milder cam running a twin plenum top end with twin flapper airflowmeters.

With 5.0, Stage 4, 404 and big quads I'd hope for 340-350 bhp.

V8 Developments heads, looking at the graphs on the RPI www the figures dont seem to bad

i was more concerned with the AFR's which might be robbing some power

x.l.r.8 · Post by **x.l.r.8** » Tue Sep 18, 2007 4:13 am

Scratching my head trying to remember the jet sizes we had, but it's not coming to me. You need to rejet those mains, there robbing you power and lots of it, as long as hte heads can breath your due to see lot's more power all through the rev range. time to weld in a sensor and get a A/F meter going. You will also save on fuel what you will spend on jets within the first month. I think after you have the jets sorted out your heads will show up next, but I would be working on rejetting. What mains and corrector's are you running now?

leylandracer · Post by **leylandracer** » Tue Sep 18, 2007 6:01 am

Thats what i was thinking

saying that, the two rolling roads where its been set-up have both said that it the best i will get using 48 dco-sp's not sure on the jet sizes etc, i think orig they had 42mm chokes fitted? now 38mm chokes
Prob some daft questions

Would bigger chokes make things better or worse?
On the last dyno run, the operator suggested using shorter ram pipes They have had some made up (Which look the Dogs-----) they bolt on to the carb rarther then slide in, he reckons less restriction???? or maybe he's just trying to sell me 8

ram pipes.

Carbs