Wild cat heads, make sense?

kokkolanpoika · Post by **kokkolanpoika** » Wed Aug 24, 2011 6:00 pm

Can some one tell me is there any sense to buy wild cat heads to get more power? How many hp i can get more for 2500£ vs my 381hp 5.2l RV8 with stage 4 heads?

http://www.automotivecomp.com/v8engines.htm
5.0 WILD CAT ENGINE 398 BHP @ 5950 RPM, 340FTLB @ 5600 RPM

approx 17hp more?

Or can someone prove over 400hp readings?

TA-performance is 1 choice. But want to know wild cat details..

Wotland · Post by **Wotland** » Thu Aug 25, 2011 7:19 am

I don't understand why to buy wildcat/TA heads to achieve 400BHP when full race RV8 heads can do the job.
http://www.southwestsportscars.co.uk/tv ... acer-hire/

kokkolanpoika · Post by **kokkolanpoika** » Thu Aug 25, 2011 7:48 am

413hp from ported RV heads on 4.5litre engine.. No way i say..

John Eales has made 416hp 5.3litre race engine..

kiwicar · Post by **kiwicar** » Thu Aug 25, 2011 8:10 am

Hi
This is presumably still a road car? the wild cat heads will give more power than stage whatever rover heads for a given state of tune (cam timing and CR) the trouble with these comparisons are that the engines are so different so it is difficult to make meaningfull comparisons.
Basically with wildcat heads, 5.2 litres and port injection you should get 420 bhp and still drive it in traffic (with care) and it will need to rev beyond 6K.
With 4.5 litres and rover heads and you will need a good induction set up you may make 420bhp on the track, the power will start with a bang at about 2500 -2750 revs and be all over by 5800 to 6000 revs, pure race engine.
The trouble is by you have bored and stroked the engine out to 5.2 litres, installed a 245 degrees at .05 cam and wildcat heads and got it all set up to give you the power you want you will be in for about £8-10K and it will need a rebuild every 30K miles or so, and it will be delicate. cant you drop a ls454 crate engine in it, more power, cheeper and with a warenty.
http://www.partsworldperformance.com/ls ... ate_engine.
Best regards
Mike

Wotland · Post by **Wotland** » Thu Aug 25, 2011 8:26 am

4.45 Tuscan challenge engine delivers his power at 7000RPM and can buzz up 7500RPM.
Not really mild tuned 4.5

kiwicar · Post by **kiwicar** » Thu Aug 25, 2011 9:16 am

Wotland wrote:4.45 Tuscan challenge engine delivers his power at 7000RPM and can buzz up 7500RPM.
Not really mild tuned 4.5

OK so they go for low VE high CR and lots of revs rather than hi VE lower CR and maximum torque over a narrow power band.
however you do it, with 4.5 litres and rover heads you are not going to be doing the shopping in it!

Best regards
mike

kokkolanpoika · Post by **kokkolanpoika** » Thu Aug 25, 2011 1:11 pm

Yes it is a road car..
Now it has got a very good drivibility, thanks to throttle bodies.. Cam is still M238. Without throttle bodies it will go like gangoroo at low revs..

Our stupid LAW dosent like to change engine our car´s. only add 20%more power and 25%cubic inches. So have to stay with rover..
Is there anywhere to see power graphs to +5l rover with wild cat heads..?
2500£ for 40hp is lot of money..

Wotland · Post by **Wotland** » Thu Aug 25, 2011 2:50 pm

If I have £2500 to spend I will take the way of supercharger/turbo kit.

kiwicar · Post by **kiwicar** » Thu Aug 25, 2011 4:24 pm

Hi
yes 40 extra horsepower, but probably on at least 10 degrees less cam timing but still give you +500 revs at the top of the powerband. Better heads mean a more flexable engine, just look at the differance between the old chevy small block and the LS series and the cams and powerbands there. yes you could add a turbo or a supercharger and get the same results or more numbers wise, but I think in this case the wildcat heads on a 5.2 litre engine would be a much nicer engine all round.
Best regards
Mike

bigaldart · Post by **bigaldart** » Thu Aug 25, 2011 6:57 pm

One question has to be which Wildcat heads? The wildcat ones are more street oriented but the twos have enormous capability. I am sure an Aussie racer made over 600hp Using the best wildcat had to offer but it was a race build and unlikely to be streetable.

Alan

kokkolanpoika · Post by **kokkolanpoika** » Thu Aug 25, 2011 7:17 pm

I understand that there is stage 1 and stage 2 heads? Stage 1 is for street and capapility approx 450hp for 5litre? Add stage 2 is for full race?
Carl Hansen ~6litre made over 600hp?

http://www.pistonheads.com/doc.asp?c=129&i=7841

Robrover · Post by **Robrover** » Fri Sep 02, 2011 1:07 am

Why don't you get the new TA heads?

TRS are getting close to 600 hp on their ex Tuscan TVR now with the prototype from the first batch (nearly all of which went to Oz) - there's some dyno sheets on their website somewhere.

TA say they are going to be selling the second batch of these heads for USD2790 complete or USD1500 bare.