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MG TD TF 1500 - Head thickness

What was the original thickness of the early TD head? What is considered to be the minimum thickness it should be?
Bruce Cunha

https://www.nemgtr.org/images/stories/Research_Lib_Files/Tuning_The_T_Type_Head_V3.pdf
George Butz III

Bruce the minimum head thickness of the head = a higher compression ratio.Maximum compression ratio depends on camshaft duration.

Static Compression Ratio
(SCR) Intake Valve Duration
(degrees @ .050" lift) Power Range
(RPM)
8.00:1 185º Idle-4,000
8.25:1 189º Idle-4300
8.50:1 194º 800-4,500
8.75:1 200º 900-4,600
9.00:1 204º 1,000-4,600
9.25:1 208º 1,200-5,200
9.50:1 212º 1,600-5,400
9.75:1 216º 1,800-5,600
10.00:1 221º 2,000-5,800
10.25:1 227º 2,400-6,200
10.50:1 233º 2,800-6,400
10.75:1 236º 3,000-6,800
11.00:1 240º 3,200-7,000
11.50:1 244º 3,400-7,200
Len Fanelli

If you can find an EXPAW head from a Woodley, originally painted green, you have won a gold watch. They castings are the same as a EXPAG but less material was removed when they were originally machined. They are thicker than the MGs and have smaller valves. But this gives plenty of scope for remaching to MG spec.

Jan T
J Targosz

3.022" is uncut for all XPAG heads. Many people consider 1/8" to be about as far as you want to go. I always recommend not cutting the head more than absolutely necessary, because they are getting a bit rare. You can bump your compression ratio with pistons if you want to go higher, and this leaves room for more head jobs in the future.
Steve Simmons

Who wouldn't want more head jobs in the future?

Tim
Timothy Burchfield

This thread was discussed between 16/01/2020 and 19/01/2020

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