Excellent content Graham, I was wondering if you ever use single cotter valves ? I ran my pintos on triple groove valves and always found I wore the grooves out mostly due to over revving I think ? Keep the videos coming 👍
depends on material, you cant harden all materials. Triple grove allow the valve to rotate so valve seats stay in better condition. When building an engine intended to spend a lot of time at very high rpm i prefer to use single cotter, they are stronger because the way the cotter grips the stem itself
Adding lash caps will reduce valve lift because your effectively making the valve longer, changing valve length alters the cam/follower contact point and therefore rocker ratio and thus lift
Hello, I am from Argentina, I have a Lima 2.3 engine, do you recommend placing a tube in each duct to improve the intake angle of the cylinder head? Have you ever adapted a Chevrolet Corsa 1.6 injection ecu to a Lima engine? (in Argentina this ecu is usually adapted to any car with a carburetor)
Going by the cam I would most likely fit 34's they will give best throttle response and low down torque, of course a dyno test might suggest otherwise for best power
that would depend on the engine, but simply looking at from a flow/lift perspective is too simplistic. Because of mechanical contraints sometimes you have to open the valve further than peak flow/lift in order to get enough opening time on the valve, or put it another way increase effective duration
@@PenguinMotors I've got a cam that claims 3.85mm lift at TDC on the inlet. planning to use it on a block with 0.34mm deck height, you recon I should be good if I mind the timing? how much clearance would you recommend as a minimum?
Interesting following this series. I wonder if the principle of different Valve seat heights as describe in David Vizard's video, would work.Yes he tacks about 4 valve heads but dropping the exhaust valve into the head would change the gas flow th-cam.com/video/-vY5Z3nCJLQ/w-d-xo.html
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Graham is a well experienced engine builder as i see how he looks into detail. And ehhm... by the way, always loved the OHC pinto
learning all the time
Excellent content Graham, I was wondering if you ever use single cotter valves ? I ran my pintos on triple groove valves and always found I wore the grooves out mostly due to over revving I think ? Keep the videos coming 👍
I do sometimes, valve material and quality do all play a part though
Aftermarket ones are not harden from the stem tip and thats why the grooves wore?
depends on material, you cant harden all materials. Triple grove allow the valve to rotate so valve seats stay in better condition. When building an engine intended to spend a lot of time at very high rpm i prefer to use single cotter, they are stronger because the way the cotter grips the stem itself
Great content Graham 👍🏾
All great stuff. Did you coat both sides of the gasket with Wellseal?
yes
Guess you Can Achieve more lift with lashcaps with radius tips.
Adding lash caps will reduce valve lift because your effectively making the valve longer, changing valve length alters the cam/follower contact point and therefore rocker ratio and thus lift
Just out of curiosity would you have a leftover oil pan for a crossflow ford that you would sell?
sorry no, infact i could do with a couple myself
Hello, I am from Argentina, I have a Lima 2.3 engine, do you recommend placing a tube in each duct to improve the intake angle of the cylinder head? Have you ever adapted a Chevrolet Corsa 1.6 injection ecu to a Lima engine? (in Argentina this ecu is usually adapted to any car with a carburetor)
Sorry can’t help the Lima is a different engine that I have never worked on
contact Esslinger engineering in California USA, they might still do the Lima. I got one of them many years ago with a special SVO aluminium head on.
Great videos Graham, on a standard pinto (With an FR30 cam) would you recommend 34 or 36mm chokes in a pair of 45s? Just for a road going Escort
Going by the cam I would most likely fit 34's they will give best throttle response and low down torque, of course a dyno test might suggest otherwise for best power
Thanks Graham
Is the rule anything more than 1/4 of valve diameter in terms of lift no more added benefit?
that would depend on the engine, but simply looking at from a flow/lift perspective is too simplistic. Because of mechanical contraints sometimes you have to open the valve further than peak flow/lift in order to get enough opening time on the valve, or put it another way increase effective duration
At what amount of lift at TDC should one start worrying about the valves hitting the piston/needing a cutout?
Typically l over 4mm but head thickness deck height and actual cam timing all play a part
@@PenguinMotors I've got a cam that claims 3.85mm lift at TDC on the inlet. planning to use it on a block with 0.34mm deck height, you recon I should be good if I mind the timing?
how much clearance would you recommend as a minimum?
Interesting following this series. I wonder if the principle of different Valve seat heights as describe in David Vizard's video, would work.Yes he tacks about 4 valve heads but dropping the exhaust valve into the head would change the gas flow th-cam.com/video/-vY5Z3nCJLQ/w-d-xo.html