Slide throttles

[Steve Rance]

Does anybody have experience driving aircooled 911’s with a slide throttle set up? Specifically in 3.0 RSR spec?

I’m looking at different engine options and am drawn in this direction. My personal experience of driving racing engines with slide throttles is that they could occasionally stick open which proved rather unfortunate. I know that the choice of cam profiles will also define the driving experience/character. I am looking to extract circa 300 bhp

I’m considering building a narrow bodied aircooled car with this as a power unit.

[2.4te]

I wish I could say I did have experience Steve, as a massive earlky 911 fan, but sadly not!

I am however in the process of rebuilding my 2.4l mechanical fuel injection air-cooled engine with a few upgrades and will watch your thread with interest!

Dave

[Yellow491]

Yes steve,i have two engines with them.
A quality one , will run on ball Bearings Keep them clean and lubed will be fine.
Most jammed from poor maintenance,or the manifolds were not dead level,when hot they would distort especially with mag manifolds.
It also depends if you are going to run mech injection which introduces more linkage,throttle response is vastly improved.
Hope this helps.

[Cheib]

I know nothing about them but remembered seeing this post of a 3.0 RSR engine a little while ago on Insta.

[Yellow491]

Cheib said:

I know nothing about them but remembered seeing this post of a 3.0 RSR engine a little while ago on Insta.

Exactly the same as mine,great engine,reliable and Withfactory slides,a good friend has teased 370bhp out of a 3.0ltr.
The slides are available repro Now and well made, sliding on ball bearings etc Around 7k for complete kit.

[Steve Rance]

2.4te said:

I wish I could say I did have experience Steve, as a massive earlky 911 fan, but sadly not!

I am however in the process of rebuilding my 2.4l mechanical fuel injection air-cooled engine with a few upgrades and will watch your thread with interest!

Dave

Good luck with the build Dave

[Steve Rance]

Yellow491 said:

Exactly the same as mine,great engine,reliable and Withfactory slides,a good friend has teased 370bhp out of a 3.0ltr.
The slides are available repro Now and well made, sliding on ball bearings etc Around 7k for complete kit.

Thanks Paul

Very helpful. Could I send you a PM? I've change my email address but PH have been hopeless in updating my profile so i cant do it via the forum.
I have something in mind. Could I ask you to send me a mail at [e-mail] when convenient and I can send you details

Kindest

Steve

[Cheib]

Steve Rance said:

I’m considering building a narrow bodied aircooled car with this as a power unit.

I am well aware that you’re very capable behind the wheel but wanted to ask a question about this Will that present problems with traction ? I ask as obviously Porsche itself went with slightly wider tyres as the power on tap increased. 2.8 RSR had 11 inch rears IIRC..so assume 3.0 RSR had at least that. 210hp RS had 7inch rear tyres as I am sure you know

[Steve Rance]

Im not too bothered at the moment. Tyres and diff technology have moved along way since then and im also looking at fitting a coilover set up on the rear axle - the chasis will need modifying to accomodate the mounting points. Thats a difficult decision as id rather retain the torsion bar set up of the original car.

[Yellow491]

Steve Rance said:

Yellow491 said:

Exactly the same as mine,great engine,reliable and Withfactory slides,a good friend has teased 370bhp out of a 3.0ltr.
The slides are available repro Now and well made, sliding on ball bearings etc Around 7k for complete kit.

Thanks Paul

Very helpful. Could I send you a PM? I've change my email address but PH have been hopeless in updating my profile so i cant do it via the forum.
I have something in mind. Could I ask you to send me a mail at [e-mail] when convenient and I can send you details

Kindest

Steve

Of course ,will pm in a bit.

[Yellow491]

Cheib said:

Steve Rance said:

I’m considering building a narrow bodied aircooled car with this as a power unit.

I am well aware that you’re very capable behind the wheel but wanted to ask a question about this Will that present problems with traction ? I ask as obviously Porsche itself went with slightly wider tyres as the power on tap increased. 2.8 RSR had 11 inch rears IIRC..so assume 3.0 RSR had at least that. 210hp RS had 7inch rear tyres as I am sure you know

No it wont be a problem,my st used to have 270bhp on 8&9 with mich tb tyres,great fun.Good dampers and springs properly set with good tyres will handle it easy,rarely is traction a problem in a 911.

[Cheib]

Yellow491 said:

Cheib said:

Steve Rance said:

I’m considering building a narrow bodied aircooled car with this as a power unit.

I am well aware that you’re very capable behind the wheel but wanted to ask a question about this Will that present problems with traction ? I ask as obviously Porsche itself went with slightly wider tyres as the power on tap increased. 2.8 RSR had 11 inch rears IIRC..so assume 3.0 RSR had at least that. 210hp RS had 7inch rear tyres as I am sure you know

No it wont be a problem,my st used to have 270bhp on 8&9 with mich tb tyres,great fun.Good dampers and springs properly set with good tyres will handle it easy,rarely is traction a problem in a 911.

Yes I suppose what I meant was with a narrow body, I am not sure what max width tyres yu can get on a narrow body car. Anyway Steve has answered the question as have you !

I’d really like to build a pre 73 hot rod one day...something like a 2.8 RSR body and mechanically but not a stripped out interior.

Edited by Cheib on Thursday 11th February 00:24

[Yellow491]

Cheib said:

Yellow491 said:

Cheib said:

Steve Rance said:

I’m considering building a narrow bodied aircooled car with this as a power unit.

I am well aware that you’re very capable behind the wheel but wanted to ask a question about this Will that present problems with traction ? I ask as obviously Porsche itself went with slightly wider tyres as the power on tap increased. 2.8 RSR had 11 inch rears IIRC..so assume 3.0 RSR had at least that. 210hp RS had 7inch rear tyres as I am sure you know

No it wont be a problem,my st used to have 270bhp on 8&9 with mich tb tyres,great fun.Good dampers and springs properly set with good tyres will handle it easy,rarely is traction a problem in a 911.

Yes I suppose what I meant was with a narrow body, I am not sure what max width tyres yu can get on a narrow body car. Anyway Steve has answered the question as have you !

I’d really like to build a pre 73 hot rod one day...something like a 2.8 RSR body and mechanically but not a stripped out interior.

Edited by Cheib on Thursday 11th February 00:24

Just get one built great fun , or look for the right car that some one else has spent the funds on,but rarely does a good properly built Car turn up with all the bases covered.Friend runs 8 under rear arches,it can be done,its a 2.4s that he has owned for 30 plus years that sports a 3.0rs style engine with 270 bhp,very light very quick,2.7rs rear arch shape.
A lot of these cars built are skin deep and no more,a 2.8 on mich tb or even better slicks,the level of grip that can be achieved is quite staggering ,especially in the wet.
Oilve comes to mind;)
Look forward to seeing you spanking that 2.7rs,plenty of fun and challenge to be had there.

[Cheib]

Yellow491 said:

Just get one built great fun , or look for the right car that some one else has spent the funds on,but rarely does a good properly built Car turn up with all the bases covered.Friend runs 8 under rear arches,it can be done,its a 2.4s that he has owned for 30 plus years that sports a 3.0rs style engine with 270 bhp,very light very quick,2.7rs rear arch shape.
A lot of these cars built are skin deep and no more,a 2.8 on mich tb or even better slicks,the level of grip that can be achieved is quite staggering ,especially in the wet.
Oilve comes to mind;)
Look forward to seeing you spanking that 2.7rs,plenty of fun and challenge to be had there.

Yes I think if a car turned up that someone else has had the bodywork done to a high standard whether it’s a stalled restoration or a hotrod etc that would be interesting. Saving the majority of the bodywork cost makes it much easier to do the man maths !

[Steve Rance]

In general, there seems to be more emphasis on visual/bodywork builds as opposed to chasis and engine work. If you ever find yourself in the unfortunate position where you view what youtube has to offer on modified aircooled cars driven/tested, you could be forgiven that braking and cornering are utterly unimportant when compared to the sound the exhaust makes, how fast it goes in a straight line or the upholstery choices the proud owner has made.

I like the cars that look stock but are anything but under the skin