Cam options for 1.8 B series
Moderators: ClaytonSpeed, balmy
-
- Posts: 11
- Joined: Sun Nov 01, 2020 6:13 pm
Cam options for 1.8 B series
Evening all
I’ve got a plan to take a stock 1.8 B series, and use a set of HS4 twin SU’s on it. When I do it, I want to put a warmer cam in too, and have the dizzy recurved to match the cam.
So, my question is, which cam? The plan is to build a 1.8 saloon that will cruise dual carriageways and motorways easily, as I’m south coast based and shows always seem to be miles away. I’m not looking to build a race car, and defo don’t want a cam that idles like a tractor, the car will be used around town in traffic as well as cruising the fast roads.
Let me know what you think!
Cheers
Baz
I’ve got a plan to take a stock 1.8 B series, and use a set of HS4 twin SU’s on it. When I do it, I want to put a warmer cam in too, and have the dizzy recurved to match the cam.
So, my question is, which cam? The plan is to build a 1.8 saloon that will cruise dual carriageways and motorways easily, as I’m south coast based and shows always seem to be miles away. I’m not looking to build a race car, and defo don’t want a cam that idles like a tractor, the car will be used around town in traffic as well as cruising the fast roads.
Let me know what you think!
Cheers
Baz
- MarinaCoupe
- Posts: 10197
- Joined: Thu May 31, 2007 5:26 pm
- Location: Bedford
- Contact:
Re: Cam options for 1.8 B series
I used a Piper 270 cam in mine with a pre 1967 MGB Lucas 25D distributor as the advance curve suits the camshaft. I used K&N filters and found that AAA needles worked best in the twin HS4 carbs.
Tickover was OK, just a little lumpy. It’s worth getting some basic gas flowing done, particularly in the exhaust port. I used standard early Marina 1.8 inlet and exhaust valves and had the valves and seats three angle cut.
If you are doing a lot of motorway and dual carriage way driving then you will be using fairly high revs, so its worth thinking about double valve springs and if you do, then use a duplex timing chain as the double springs put more strain on the valve gear train.
Tickover was OK, just a little lumpy. It’s worth getting some basic gas flowing done, particularly in the exhaust port. I used standard early Marina 1.8 inlet and exhaust valves and had the valves and seats three angle cut.
If you are doing a lot of motorway and dual carriage way driving then you will be using fairly high revs, so its worth thinking about double valve springs and if you do, then use a duplex timing chain as the double springs put more strain on the valve gear train.
Re: Cam options for 1.8 B series
I've got a 285 in mine and I'm expecting it to be a bit on the lumpy side, that's with a Peter Burgess fast road head (with the factory "big valves" from the early 70's). Currently it's still in the inlaw's garage, I'll report back hopefully later this year! I've got one of the fully mappable 123 distributors on the way that will hopefully help to tame some of the bottom end roughness. Duplex chain with a vernier pulley. That'll be with twin HS4s of course.
Matt
1974 1973 Tundra Black Tulip 1800 SDL TC Estate "Mud"- Freshly Franked rolling shell.
Really, really horrible 1974 Black Tulip 1300 DL- Basically compost.
1974 1973 Tundra Black Tulip 1800 SDL TC Estate "Mud"- Freshly Franked rolling shell.
Really, really horrible 1974 Black Tulip 1300 DL- Basically compost.
Cam options for 1.8 B series
Initially a 255 in my TC. Flat torque curve-ideal for everyday use and easy overtaking.
1974 Marina Tc Coupe - 1950CC
1982 Morris Ital HL Estate - 7600 miles from new
1992 Lada Niva Cossack - brilliant
2008 Ducati 1098R TB21 LE 200bhp/99lb/ft of a monster on two wheels. All from 1198cc
1998 Laverda 750 Formula-rare
1997 Ducati 916 Senna - Awesome
!974 Honda CD175-awaiting resto - now stripped
1982 Morris Ital HL Estate - 7600 miles from new
1992 Lada Niva Cossack - brilliant
2008 Ducati 1098R TB21 LE 200bhp/99lb/ft of a monster on two wheels. All from 1198cc
1998 Laverda 750 Formula-rare
1997 Ducati 916 Senna - Awesome
!974 Honda CD175-awaiting resto - now stripped
Re: Cam options for 1.8 B series
You've got a few more cc's than everyone else mind
Matt
1974 1973 Tundra Black Tulip 1800 SDL TC Estate "Mud"- Freshly Franked rolling shell.
Really, really horrible 1974 Black Tulip 1300 DL- Basically compost.
1974 1973 Tundra Black Tulip 1800 SDL TC Estate "Mud"- Freshly Franked rolling shell.
Really, really horrible 1974 Black Tulip 1300 DL- Basically compost.
- locost_bryan
- Posts: 3087
- Joined: Fri May 22, 2009 2:43 am
- Location: Auckland, New Zealand
Re: Cam options for 1.8 B series
Does that distributor have vacuum advance? (Can never remember which MGBs had what)MarinaCoupe wrote: ↑Sun Mar 14, 2021 10:08 pm I used a Piper 270 cam in mine with a pre 1967 MGB Lucas 25D distributor as the advance curve suits the camshaft. I used K&N filters and found that AAA needles worked best in the twin HS4 carbs.
Bryan
Auckland NZ
1972 Morris Marina 1750 TC Coupe "Ozzy"
Auckland NZ
1972 Morris Marina 1750 TC Coupe "Ozzy"
- MarinaCoupe
- Posts: 10197
- Joined: Thu May 31, 2007 5:26 pm
- Location: Bedford
- Contact:
Re: Cam options for 1.8 B series
Yes Bryan with vacuum advance.
- locost_bryan
- Posts: 3087
- Joined: Fri May 22, 2009 2:43 am
- Location: Auckland, New Zealand
Re: Cam options for 1.8 B series
Cool, that ties in well with the recommendation from the other thread about vacuum advance improving economy at cruising speeds.
Bryan
Auckland NZ
1972 Morris Marina 1750 TC Coupe "Ozzy"
Auckland NZ
1972 Morris Marina 1750 TC Coupe "Ozzy"