The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
It is currently Fri Oct 19, 2018 8:42 am

All times are UTC




Post new topic  Reply to topic  [ 11 posts ] 
Author Message
 Post subject: More Horses
PostPosted: Thu Sep 20, 2018 8:55 am 
Offline
TDC Member

Joined: Wed Sep 19, 2018 8:19 am
Posts: 9
My wife and I have, for the past two weeks, been the proud owner of a very nice red 1300 AGK 158S. I had no intention of buying a Dolomite and had gone to see another car at this dealer near to where we live but the Dolomite stood out and was in our price range. After a short test drive, we decided to buy and it has been very much admired where we live in south Lincolnshire. Comfortable, with nice handling, gearbox and brakes makes for a desirable car apart from the lack of power. Some might want to avert their eyes at this stage but we also have a 1966 Riley Kestrel 1300 which in standard form puts out a respectable 72 gee-gees. The performance difference is very marked even allowing for the lower weight of the Kestrel. I am not after a hot motor just about another 12/15 hp and propose obtaining a spare head to port with twin carbs and possibly the twin exhaust. I have the chance of a 1500 head with carbs and manifold and would like to know if the 1500 head will fit the 1300 block with no mods? I assume it will as the bores are the same on the two engines. Any comments please from the many knowledgeable members out there. I do not wish to have the car off the road for more than a month so nothing drastic such as engine changes.


Top
   
 Post subject: Re: More Horses
PostPosted: Thu Sep 20, 2018 9:52 am 
Offline
TDC Committee
User avatar

Joined: Wed Sep 27, 2006 9:59 am
Posts: 1498
Location: Coventry
The 1500 head will fit, but I suspect you will need to skim it significantly to get a decent compression ratio.

I can't remember the combustion chamber volumes off the top of my head.

_________________
BWJ
1966 Triumph 1300 Royal Blue
1966 Triumph 2000 Blue
1965 Triumph 2000 black and rust
1967 BSA B40wd green
2018 Jaguar E pace 2018
NOBODY expects the Canley Inquisition!


Top
   
 Post subject: Re: More Horses
PostPosted: Sat Sep 22, 2018 7:37 am 
Offline
Future Club member hopefully!
Future Club member hopefully!
User avatar

Joined: Tue Oct 03, 2006 6:38 pm
Posts: 2598
Location: Birmingham
Skim the head until the face is level with the machined surface where the manifold gasket fits against the head. Hard to explain it but with the head on the bench you will see what I mean. That will give a compression ratio of 10.25:1 or very close, which should run nicely and still leaves enough meat around the water channels in the head. I've long maintained that the compression ratio is artificially low on the 1300, possibly to de-tune the engine and give the 1500 a reason for being.

_________________
Vindicator Sprint, Honda Fireblade RRX 919cc, re-powered by AB Performance. Quick.
1995 Trusty Peugeot 306 XND, no turbine, 227K miles young.
1997 Trusty Peugeot 306 GLX TD, 90K miles and soon to ride again..
Alfa Romeo 147 1.9 JTD 150 Ti Lusso , no longer smoking.
Various other transient runners for selling.


Top
   
 Post subject: Re: More Horses
PostPosted: Sat Sep 22, 2018 12:33 pm 
Offline
TDC Member

Joined: Wed Sep 19, 2018 8:19 am
Posts: 9
Thanks, both for your replies. Obviously, I am on a steep learning curve and although I know lots about our 1966 Riley Kestrel and 1936 Riley Merlin I know nothing about Triumphs. It now turns out that the heads I have been offered are from Mk3 Spitfires so my question is are these any good? Jod mentions a c/r of over 10-1, is this not a bit on the high side for an every day road car? All and any advice gratefully received.
Graham Martin


Top
   
 Post subject: Re: More Horses
PostPosted: Sat Sep 22, 2018 5:24 pm 
Offline
TDC Member

Joined: Fri Jan 08, 2016 9:00 pm
Posts: 859
pm sent.


Top
   
 Post subject: Re: More Horses
PostPosted: Sat Sep 22, 2018 6:02 pm 
Offline
TDC Committee
User avatar

Joined: Wed Sep 27, 2006 9:59 am
Posts: 1498
Location: Coventry
They're the head used on the 1300tc, so yes they're good.
You would also gain with a matching cam change

_________________
BWJ
1966 Triumph 1300 Royal Blue
1966 Triumph 2000 Blue
1965 Triumph 2000 black and rust
1967 BSA B40wd green
2018 Jaguar E pace 2018
NOBODY expects the Canley Inquisition!


Top
   
 Post subject: Re: More Horses
PostPosted: Mon Sep 24, 2018 5:14 pm 
Offline
TDC Member

Joined: Sun Oct 26, 2008 7:26 am
Posts: 1898
A spitfire mk3 produced 75bhp (but remember the power was measured in a different way then so probably nearer 70bhp)

To get that you would need the head and cam, but watch cam journals, I suspect the 1300 needs a large cam journal with no cam bearings, but the cams re available with that size journal from Canleys etc.

The single 1 1/2" SU will make almost as much power as a pair on a 1500, so I think the situation would be the same on the 1300. However.....If you look to use the 1500 twin cast manifold and downpipe, you cannot fit the single carb inlet manifold. Not sure about the club 4 branch manifold.

Don't be tempted to get a cam that is "too hot" as it moves the power band up the rev range and makes life hard work.

_________________
Clive Senior
Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


Top
   
 Post subject: Re: More Horses
PostPosted: Tue Sep 25, 2018 8:22 am 
Offline
TDC Member

Joined: Wed Sep 19, 2018 8:19 am
Posts: 9
Thanks Clive.
The question of camshaft journals is obviously something I was unaware of, hence the undoubted value of Forums such as this. Would anyone know what type I have from the engine No which is DH80488HE? My initial intention is to fettle and smooth ports on the Spitfire head, leave the single carb and exhaust as it is and change camshaft for either a Spitfire one or one similar. As you say nothing too fierce! Always best not to change too many things at one time as you can easily lose your way if things do not work out. If this goes well then carbs/exhaust would be next.
Graham Martin

1978 1300 Dolomite ( now club member)
1966 1300 Riley Kestrel
1936 9HP Riley Merlin


Top
   
 Post subject: Re: More Horses
PostPosted: Wed Sep 26, 2018 4:28 pm 
Offline
TDC Member

Joined: Sun Oct 26, 2008 7:26 am
Posts: 1898
Pretty sure you have a large journal camshaft. You could fit cambearings and use a genuine mk3 cam, or get one on a large journal blank. Newman cams seem to be very good, or try canley classics. The DH engine is essentially the same as a mkIV spitfire.

_________________
Clive Senior
Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


Top
   
 Post subject: Re: More Horses
PostPosted: Thu Sep 27, 2018 6:42 pm 
Offline
TDC Member

Joined: Wed Sep 19, 2018 8:19 am
Posts: 9
Thank you Clive. Have a spitfire head coming tomorrow and have ordered a Newman camshaft. Going to be busy!!!
Graham Martin


Top
   
 Post subject: Re: More Horses
PostPosted: Thu Sep 27, 2018 7:59 pm 
Offline
TDC Member

Joined: Sun Oct 26, 2008 7:26 am
Posts: 1898
Excellent. You will need to do a needle swap, I am sure somebody can recommend something suitable. Afraid I have no experience, but I am sure plenty of others have. Worth asking (in a separate thread is your best bet)

_________________
Clive Senior
Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 11 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited