The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Re: Sprint turbo
PostPosted:Sat Jan 15, 2022 10:40 pm 
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There was a blue one on that Aussie site years ago (May be 15 years ago) and this Spitfire…
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 Post subject: Re: Sprint turbo
PostPosted:Sun Jan 16, 2022 12:41 pm 
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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


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 Post subject: Re: Sprint turbo
PostPosted:Mon Jan 17, 2022 2:16 pm 
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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). :shock:
https://www.moss-europe.co.uk/catalogse ... percharger


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 Post subject: Re: Sprint turbo
PostPosted:Mon Jan 17, 2022 2:42 pm 
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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!

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1980 Dolomite Sprint Track Day Car....KLJ 895W. now redtopiffied :P

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 Post subject: Re: Sprint turbo
PostPosted:Mon Jan 17, 2022 4:19 pm 
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Like this…

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


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 Post subject: Re: Sprint turbo
PostPosted:Mon Jan 17, 2022 8:07 pm 
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Location:Harrow Middlesex
Quote:
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). :shock:
https://www.moss-europe.co.uk/catalogse ... percharger
There dear


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 Post subject: Re: Sprint turbo
PostPosted:Mon Jan 17, 2022 8:13 pm 
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Dont think ive got enough room on the right hand side of my engine EFI plenum in the way

Dave


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 Post subject: Re: Sprint turbo
PostPosted:Tue Jan 18, 2022 2:28 pm 
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Quote:
Quote:
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). :shock:
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

_________________
1980 Dolomite Sprint Track Day Car....KLJ 895W. now redtopiffied :P

viewtopic.php?f=19&t=23031

Volkswagen Golf MK3 Gti....R301UUJ. RIP 22-5-13
Volkswagen Golf MK4 TDGTI 150 MM53VNT Sold 7-8-17
BMW 320d Coupe M-Sport YL08 XBZ with factory fitted Performance Pack - Sold 22/05/21
BMW 330d Touring M-Sport WN63 XPY - best daily ever

Proud TDC Member!


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 Post subject: Re: Sprint turbo
PostPosted:Fri Jan 21, 2022 10:07 pm 
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Joined:Mon Mar 11, 2013 10:18 pm
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Quote:
Quote:
Quote:
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. :D
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.

_________________
1970 Triumph 2000 Estate w/ RV8
1980 Triumph Dolomite Sprint
2003 Holden Ss Ute
1969 Dodge Charger
1973 Triumph Stag
1961 Standard Atlas


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