Rover v8 3.9 valve springs & boost?

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Pxr5
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Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

At what boost will std springs (& cam) be ok with?, keeping well below the max RPM, thanks



stevieturbo
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Re: Rover v8 3.9 valve springs & boost?

Post by stevieturbo »

The cam wont care...and presumably if keeping a standard cam you dont intend to be using much boost anyway, so wouldnt worry too much.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

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Re: Rover v8 3.9 valve springs & boost?

Post by Eliot »

stevieturbo wrote:
Wed May 01, 2019 5:36 pm
The cam wont care...and presumably if keeping a standard cam you dont intend to be using much boost anyway, so wouldnt worry too much.
Translation: why are you wasting your time with std stuff
Eliot Mansfield
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Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

not at all helpfull......

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Re: Rover v8 3.9 valve springs & boost?

Post by unstable load »

Pxr5 wrote:
Sun May 05, 2019 10:13 pm
not at all helpfull......
Read the post properly...
The cam wont care...and presumably if keeping a standard cam you dont intend to be using much boost anyway, so wouldnt worry too much.
Cheers,
John

Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

Re; Translation: why are you wasting your time with std stuff

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Re: Rover v8 3.9 valve springs & boost?

Post by unstable load »

I guess that depends on you and what your particular sensitivities are.
I saw it as an answer to your question, but you clearly don't.
Cheers,
John

Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

unstable load, Im greatfull for your input, I think the idea of tech help is that some one asks a question, & they get a responce that is constructive and perinent to the question...... Re; just saying, why bother is neither!

Eliot, Do me a favour, never respond to anything I ask, ok

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Re: Rover v8 3.9 valve springs & boost?

Post by stevieturbo »

Eliot wrote:
Sat May 04, 2019 4:42 pm
stevieturbo wrote:
Wed May 01, 2019 5:36 pm
The cam wont care...and presumably if keeping a standard cam you dont intend to be using much boost anyway, so wouldnt worry too much.
Translation: why are you wasting your time with std stuff

Not at all....standard cam will work perfectly fine with boost. And if engine etc is already together and in the car....not really a lot of sense pulling it all apart unless he really wants to.

And likewise with springs...the fact it is still a standard cam and most likely low boost and has stated low rpm..there just isnt anything in that area to be concerned about, unless say the parts had 200k on them and they probably need replaced anyway.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

Yes, I would have thought a non STD spec cam would be when you have forged pistons rods etc, Im on Rover cast pistons so thats why i fitted a new STD cam & followers.

stevieturbo
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Re: Rover v8 3.9 valve springs & boost?

Post by stevieturbo »

If it was a new build and you were actually buying a cam, I definitely would have bought something better than standard.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

I stripped the engine & drilled tapped the mains for cross bolting, amongst my new RV8 parts I have was a cam, specs of 200 @50" & lift 433" in & ex'. so I used that.
For a road car to smoke about in, I thought that would work quite well....

stevieturbo
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Re: Rover v8 3.9 valve springs & boost?

Post by stevieturbo »

It will...but always room for improvement.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

Pxr5
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Re: Rover v8 3.9 valve springs & boost?

Post by Pxr5 »

The question is though, at what level do you need rods, pistons & springs?

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Re: Rover v8 3.9 valve springs & boost?

Post by DEVONMAN »

Pxr5 wrote:
Mon May 13, 2019 4:39 pm
I stripped the engine & drilled tapped the mains for cross bolting, amongst my new RV8 parts I have was a cam, specs of 200 @50" & lift 433" in & ex'. so I used that.
For a road car to smoke about in, I thought that would work quite well....
When you cross bolted the mains, did you have the block crank tunnel line bored ?
1950 A40 Devon Hotrod with 5.0 twin turbo RV8.
EDIS8 wasted spark, Holley Injection.
Been as far as the Moon and back in 57 years of driving. Same Car, 5 engine upgrades !!!


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