RV8 Engine Weight

Author
Discussion

The Black Flash

Original Poster:

13,735 posts

199 months

Tuesday 10th June 2008
quotequote all
Hi to the PH engine gurus...I have a question regarding the venerable Rover v8.

I see the engine quoted as weighing 320lbs...is that an accurate figure? I am looking into engine options at the mo and am stuggling to engines of a similar capacity which are that light, even much more modern ones. Even v6s seem to be heavier (Duratec 30 for example is 450lb(!), mitsibishi's 6G72 is 350lb, cossie 24v is only a few pounds lighter, etc).
Anyone know for sure?

LS7427ci

91 posts

192 months

Tuesday 10th June 2008
quotequote all
Not really no, how much power do you want to run??? Whats this engine going in???

rev-erend

21,430 posts

285 months

Tuesday 10th June 2008
quotequote all
I think 320 ~ 360 lbs would be a ball park figure.. would depend on how many ancillaries you add..

Marquis_Rex did a detailed breakdown by weight of all the parts.. but it's not easy to find.

350Matt

3,740 posts

280 months

Tuesday 10th June 2008
quotequote all
320lbs seems a bit light to me, the engine got bit heavier over its lifetime as well I'd have said 385lb was nearer the mark for 4.6 inc ancillaries ( which is the one you want)

Matt

The Black Flash

Original Poster:

13,735 posts

199 months

Tuesday 10th June 2008
quotequote all
Thought it sounded a bit light.

It's for a Dax Rush, I'm just looking at all options before deciding on anything in particular. I was thinking that I could maybe find something slightly smaller in capacity which was lighter, and perhaps supercharge it. (I don't want to use a turbo though) However, as I said all of the v6s seem to be of a similar weight, so there doesn't seem to be much benefit in doing that. The cossie is the lightest candidate I've yet found, but I'm open to any other ideas smile

LS7427ci

91 posts

192 months

Tuesday 10th June 2008
quotequote all
If your going to run a V8 I'd opt for an LS over a Rover or chevy do build a 3.2 V6 with a charger on it stanard, it punches good ish power.
How many HP's are you looking for????

anonymous-user

55 months

Tuesday 10th June 2008
quotequote all
If you're looking for a light engine, you could do worse than a Mazda rotary.

The Black Flash

Original Poster:

13,735 posts

199 months

Tuesday 10th June 2008
quotequote all
LS7427ci said:
If your going to run a V8 I'd opt for an LS over a Rover or chevy do build a 3.2 V6 with a charger on it stanard, it punches good ish power.
How many HP's are you looking for????
People keep saying about LS motors, and they do look good if you're after big power, but they are considerably heavier than the Rover as far as I can see, and you're looking at what, 6-7 grand for an LS1 with all ancilliaries?
A v8 is never going to be a lightweight build but I don't want it heavier than it has to be.

I'm after say an easy 250hp to start with, but I'd like the potential to go bigger later. If it's a v8 I'd have thought that 300-320 would be quite enough, though I'm guessing here.

LS7427ci

91 posts

192 months

Tuesday 10th June 2008
quotequote all
You'll get an LS2 for in under that money and be 400+hp, power to weight wouldn't matter to much then maybe?????

Edited by LS7427ci on Wednesday 11th June 08:38

900T-R

20,404 posts

258 months

Wednesday 11th June 2008
quotequote all
In a car as light as a Seven-style thing, you want the lump as light as possible - I'd gladly trade another 100 hp for 50 lbs less weight. To be hoest, I don't even see the point of LSx conversions in 1,100 kgs Tivs for this very reason - why accept any extra weight straining suspensino and brakes and potentially upsetting the balance, for the sake of going from 'slightly too much power' to 'way too much power'?wink

LS7427ci

91 posts

192 months

Wednesday 11th June 2008
quotequote all
This is only 25kg were talking about I dont think 100hp trade off for 25kgs your going to notice????

900T-R

20,404 posts

258 months

Wednesday 11th June 2008
quotequote all
LS7427ci said:
This is only 25kg were talking about I dont think 100hp trade off for 25kgs your going to notice????
25 Kgs is not insignificant in terms of handling in a lightweight vehicle. Particularly one where arguably anything much over 300 bhp will be wasted on the chassis...

The Black Flash

Original Poster:

13,735 posts

199 months

Wednesday 11th June 2008
quotequote all
Exactly my thinking. Power to weight isn't my worry, it's how the weight affects the handling.

350Matt

3,740 posts

280 months

Wednesday 11th June 2008
quotequote all
How about the audi 1.8T unit used in a lot of elise conversions?
Its pretty small for a modern engine and make 250 ponies without any bother.
And with a better turbo, pisotns etc 300+ is on the cards

Matt

rev-erend

21,430 posts

285 months

Wednesday 11th June 2008
quotequote all
Fit a lightweight V8 like this :




400bhp .. weight 200lbs biggrin
http://www.h1v8.com/page/page/1562068.htm


The Black Flash

Original Poster:

13,735 posts

199 months

Wednesday 11th June 2008
quotequote all
350Matt said:
How about the audi 1.8T unit used in a lot of elise conversions?
Its pretty small for a modern engine and make 250 ponies without any bother.
And with a better turbo, pisotns etc 300+ is on the cards

Matt
Don't really want a turbo engine. Supercharger maybe, turbo no with me.

The Black Flash

Original Poster:

13,735 posts

199 months

Wednesday 11th June 2008
quotequote all
rev-erend said:
...cost, £15000. cry

That really is right up my street though. Apart from the whole £££ thing.

rev-erend

21,430 posts

285 months

Wednesday 11th June 2008
quotequote all
Why not just put a Hyabussa engine in there..

deetes

413 posts

234 months

Wednesday 11th June 2008
quotequote all
The Black Flash said:
Thought it sounded a bit light.

It's for a Dax Rush, I'm just looking at all options before deciding on anything in particular. I was thinking that I could maybe find something slightly smaller in capacity which was lighter, and perhaps supercharge it. (I don't want to use a turbo though) However, as I said all of the v6s seem to be of a similar weight, so there doesn't seem to be much benefit in doing that. The cossie is the lightest candidate I've yet found, but I'm open to any other ideas smile
A friend of mine is hill climbing and sprinting a Rover KV6 with throttle bodies etc in a Dax Rush. He regularly has fastest time of day. Haven't got his contact details to hand, but will have soon.

deetes

413 posts

234 months

Wednesday 11th June 2008
quotequote all
http://www.mjengineeringscotland.ltd.uk/

That's a link to the guys running the Dax with the KV6. Speak to Les or Mike