TR7 Twin 45's on Ebay

[dursleyman]

Just popped up on Ebay, a Triumphtune manifold and a pair of DHLA45's for a TR7

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... SS:GB:1120

Russ

1980 TR7 Sprint DHC, 1981 TR7 Sprint DHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

[img]http://i1040.photobucket.com/albums/b410/dursleyman/TR7%20web%20picture/IMG_0479-Optimized.jpg[img]

[Cobber]

Nice!

"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

80'Triumph TR7, 73'Land Rover (Ford 351. V8),
'89 Ford Fairlane
'98 MG-F, 69'Ford F250.

[Hasbeen]

Very nice, & worth every penny if you want more poke from a 2 valve engine. However, they would only do anything much for you, with a head job, & a suitable cam, & a lift in compression ratio, if it was a US spec engine.

Hasbeen

[bmcecosse]

Can't see how they would help a 2 valve engine - the 1 3/4" SUs are plenty big enough for the air flow required. And the hassle these carbs will provide........

[Cobber]

Exactly what hassle are you referring to?
Tales of woe about Dellorto DHLA and Weber DOCE carbs are from those who don't know how to tune them, once tuned they're fine and should stay in tune providing they aren't mucked about with.

"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

80'Triumph TR7, 73'Land Rover (Ford 351. V8),
'89 Ford Fairlane
'98 MG-F, 69'Ford F250.

[busheytrader]

Russ,

Have you had a look at the Triumphtune / car and car conversions article that I posted some time back about suspension and tuning the 7 back in the 80's?

There was a section on carbs, cams, induction and exhaust which included webers so could help with info.

Adam

[bmcecosse]

'Once tuned' is the clue. Jets/chokes/emulsion tubes all cost a fortune... I agree there is then no reason why they should ever go off tune. But the SUs are so simple and reliable, also holding their tune , and can easily pass all the air a standard 2 valve engine needs. I can't imagine the fuel economy being 'improved' any with twin 45s! [;)] On the upside though...they are just down the road from me....... [:)]

[sydney.wedgehead]

I can't speak about DHLAs from experience but 45 DCOEs make the most fantastic sounds across the full rev range - the sort of sounds that make you smile incessantly while behind the wheel.

In terms of performance they yielded around a one second improvement of my lap times during club super sprints.

Obviously it takes time and effort to set them up with the right emulsion tubes and jets, but once setup properly tuning only requires checking balance, and this requires less adjustment than tuning SUs which require both mixture (jet height) and balance adjustment.

Around town, using light throttle, the fuel usage was similar to SUs, but the problem is that you'll keep wanting to hear them working hard! The last fuel check I did showed that when driving for pleasure (read that as using the loud pedal a lot) yielded a fuel economy > 18 litres / 100 kilometres.

Owen, aka:
- Marsu (570 posts, last dated 28 Nov 2011)
- omichaelshar (557 posts, last dated 17 Mar 2009)

[Cobber]

Ooooooohhhhh yeah! The induction sound is glorious from both DHLAs and DOCEs. [:D]
The Dellotos are pretty well much like the Webers but are IMHO a little bit better.
There should be a small improvement in volumetric efficiency by changing to DHLA or DCOE carbs but will need a tuned length exhaust header, a good cam, a high compression ratio and a worked head to get the best from them.

Don't get me wrong, the SU cabies are fine instruments and I like them, but they don't put a smile on my dial like these things do!

"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

80'Triumph TR7, 73'Land Rover (Ford 351. V8),
'89 Ford Fairlane
'98 MG-F, 69'Ford F250.

[dursleyman]

Cobber, I couldn't agree more about the noise, a set of 45's just sound fantastic when pushing on a bit. Can't wait to get my new Sprint motor with 45's built and installed.

Russ

1980 TR7 Sprint DHC, 1981 TR7 Sprint DHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

[img]http://i1040.photobucket.com/albums/b410/dursleyman/TR7%20web%20picture/IMG_0479-Optimized.jpg[img]

[Graham.Fountain]

Had a pair of Dellorto 45s on a (fake) TR7 Sprint, ported a bit and blueprinted, with a re-profiled cam, and a good exhaust manifold and system. According to Dave Bogg in E. Lutton That gave 145 bhp at the wheels (about 190bhp at the flywheel). And, it was much, much more fun to drive than a TR7v8 with 10 more hp (P6 pistons & cam, under ported SD1 heads, etc., but standard carbs), because the Sprint's peak torque was so much further up the rev range.

Also, driving 30 miles to work and back, it gave almost exactly the same fuel consumption as on the SUs – about 27 mpg, as I remember. The big problem was the locking fuel cap had been leaking water into the tank. That hadn't been a big problem with the SUs, but in the Dellortos, the water rusted the steel parts inside the carbs, which shed bits that kept blocking the idle jets. That took a surprisingly long time to find and fix. Then a Discovery buggered it.

I'm thinking of doing something similar with the doly (it's that or mod the Jag HS8s I have to go under the lid). But the exhaust manifold is going to be the problem, because the left suspension tower on the doly is a bit in the way. Some of the tube manifolds need a bulge in the bonnet; they take that circuitous a route to get round it.

TR7 Sprint VVC 697S (some of)
TR7 DHC Sprint A TR7 16V (fake, rusty):
B&Y '73 Doly Sprint (kids!)

[sydney.wedgehead]

Here's an audio clip of 1st to 3rd at full throttle. The tune was still not quite right and you can hear a hesitation on the transition to main jets.
http://picosong.com/Pdv5/

Owen, aka:
- Marsu (570 posts, last dated 28 Nov 2011)
- omichaelshar (557 posts, last dated 17 Mar 2009)

[Cobber]

That's only an indication of how good they sound. No offense Owen, but for some (probaly technical) reason, no audio recording ever seems to do justice to a great sounding engine, they always sound much better in person.


"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

80'Triumph TR7, 73'Land Rover (Ford 351. V8),
'89 Ford Fairlane
'98 MG-F, 69'Ford F250.

[Philip]

I love my 45DCOEs. In my case they were fitted in the 80s by the PO.

Fuel economy isnt great but the induction roar is wonderful.

Still standing !

[jeffremj]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Graham.Fountain</i>

Had a pair of Dellorto 45s on a (fake) TR7 Sprint, ported a bit and blueprinted, with a re-profiled cam, and a good exhaust manifold and system. According to Dave Bogg in E. Lutton That gave 145 bhp at the wheels (about 190bhp at the flywheel).<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">This was probably an over-estimate. Compare this output to a 2 litre road car with 16V and fuel injection (Ford/Vauxhall) - they give around 150bhp. To get to 190 bhp, the engine would have to have peak power at very high revs. - well over 7000rpm - was this the case? My 16V gave 140bhp on standard SUs at 6100rpm. This compared well to another TR7 V8 with a Holley that only got around 155bhp on the same rolling road.
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">And, it was much, much more fun to drive than a TR7v8 with 10 more hp (P6 pistons & cam, under ported SD1 heads, etc., but standard carbs).<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">My TR7 V8 got 165bhp on the same rolling road with 195 torks - P5B, fast road cam, Rhoads lifters, DIY computer controlled ignition with standard SUs. 200 bhp is probably another over-estimate.
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Also, driving 30 miles to work and back, it gave almost exactly the same fuel consumption as on the SUs – about 27 mpg, <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">That is impressive - over a year of commuting a similar distance, my TR7 16V only got 25mpg, the TR7 V8 getting 22mpg.