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L24 in Ford Model B
- Thread starter Coyd
- Start date
Coyd
Well-Known Forum User
I’ve had my roadster for 40 years, used to have an American v8 in it, decided to go a different route. Really like engine but it’s always disappointed me on power.
We’re just tearing engine down and sorting it out. It’s a Dave Jarman engine, but it’s got a Bp 320 cam and all the power is 3000 rpm upwards. I got onto piper cams and they advised a 270 cam but it’s only got .395 lift compared to .430 lift which sounds very disappointing. What cam do you run ? Currently I’m on 1 3/4 Su’s I eventually want webers
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It sounds like you want a racy cam but lowdown power which is difficult to achieve. Power from 3000 isn't too bad really, most sporty L24s pick-up at about 4000 in my experience but do have sufficient power below that to drive 'normally' without bogging down. Irrespective of SUs or Webers.
High lift and long duration may also necessitate cut-outs in the pistons for valve clearance so be careful what you wish for.
High lift and long duration may also necessitate cut-outs in the pistons for valve clearance so be careful what you wish for.
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I expect you have another problem besides the excessive valve guide wear. When a valve is closed the valve guide wear isn't going to affect compression or gas seal.
What were the other cylinders like re leak down test?
Coyd
Well-Known Forum User
We’ve worked it out as standard cam is .410lift
I don’t understand why Piper should market the 270 cam as a street race cam
What I want is
other cylinders worst besides no. 6 was 10%
best 5% leak
6 cylinder has severe valve seat wear as you can see.
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Number 6 exhaust valve can tend to run hot due to less cooling.
Alphabettispaghetti
Club Member
Have you looked at the Kameari stuff?
Do they have power/torque graphs for their cam on a mildly modified L24 with standard Hitachi carbs (which are good by the way)? I'm asking because I'd like to compare with a standard engine.