Sprint turbo

[RichardHyde]

There was a blue one on that Aussie site years ago (May be 15 years ago) and this Spitfire…

[new to this]

If i go ahead with turbo,ill go for log type exhaust manifold,when i made the inlet manifold i used 45mm tube, but when i checked the exhaust manifold gasket yesterday,i think you need a big diam tube,but room is tight

[MIG Wielder]

As an alternative to the turbo-charger, how about the supercharger route to the same end. Moss do one for the MGB and if it fits that, then a Sprint shouldn't be too difficult with a bit of machining.
The big problem is the price..... £££££££ (lots).
https://www.moss-europe.co.uk/catalogse ... percharger

[lazeruspete]

supercharging would be the better option in my opinion, simply because you're not using exhaust gases to drive it.

As Carledo suggests, the reasons not to do it far outweigh the reasons to do it(other than it being an interesting engineering exercise of course)

i think intercooling it sufficiently would also be a significant challenge within the constraints of a Dolomites packaging.

i'd love to see someone try though!

[RichardHyde]

Like this…

https://triumphowners.com/to-car/supercharged-dolly/

[new to this]

As an alternative to the turbo-charger, how about the supercharger route to the same end. Moss do one for the MGB and if it fits that, then a Sprint shouldn't be too difficult with a bit of machining.
The big problem is the price..... £££££££ (lots).
https://www.moss-europe.co.uk/catalogse ... percharger

There dear

[new to this]

Like this…

https://triumphowners.com/to-car/supercharged-dolly/

Dont think ive got enough room on the right hand side of my engine EFI plenum in the way

Dave

[lazeruspete]

As an alternative to the turbo-charger, how about the supercharger route to the same end. Moss do one for the MGB and if it fits that, then a Sprint shouldn't be too difficult with a bit of machining.
The big problem is the price..... £££££££ (lots).
https://www.moss-europe.co.uk/catalogse ... percharger

There dear

you're going to be in for this kind of money if you want to do it without it blowing up

[roger440]

But go ahead and prove me wrong if you think you're good enough!

Steve

Come on Steve, that's not like you to be arrogant! I'm sure you didn't mean it that way.

Didn't mean to come off as arrogant! I'd kinda like to see it done, just as intelectual engineering interest!

Problems offhand to start with,

The block isn't strong enough, particularly round the centre main web

The crank isn't strong enough (spend enough on tuftriding and stress relief and it MIGHT be)

The conrods aren't really man enough.

The standard compression ratio is too high.

The way the head is secured isn't really up to turbo combustion pressures

Ditto the head gasket.

The cam design doesn't allow for variations in cam timing between inlet and exhaust for max benefit.

Internal engine cooling isn't good enough, a turbo will generate almost twice as much heat as NA.

Packaging IS the big one though. No matter how you slice it, there is no WAY you can get a turbo near enough to the head to avoid massive lag. Roger's simple suggestion of reversing the manifold won't work, the holes don't line up. And in any case the turbo needs to be more or less in the middle or the pulse pathways are all different lengths. So, unless you are willing to have the turbo poking up through the bonnet like some American dragster, it's a bit of a non starter.

The final nail in the coffin is that there are at least a half dozen purpose built turbo'd engines that WILL fit the hole, deliver decent and reliable power increases and cost a lot less (and deliver more) than anything you can do with the Sprint lump. Yes it was cutting edge tech in it's day, but that was 50 years ago, engines have moved on since then!

Steve

I reckon you can get it in, using a log manifold as per the spitfire. Equally, being a supercharger fan, with much experience in fitting these to other stuff, again i reckon it could be done.

But everything you say about the engine shortcomings wont go away. Its just not a good starting point. Especially something with an unstable cylinder head / block joint!

Just because something can be done, doesnt mean you should! There a reason all sorts of other stuff is getting fitted.