Advice on engine frame please!

Technical advice Q&A
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Allrand
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#21 Re: Advice on engine frame please!

Post by Allrand » Sat Oct 17, 2026 1:55 pm

Welded or brazed?
Randall Botha
'64 3.8 fhc & '51 Mk 7 (now sold), previously 3.8 S-type x2, 2.4 Mk 1, XJ6 S1.

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mgcjag
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#22 Re: Advice on engine frame please!

Post by mgcjag » Sat Oct 17, 2026 6:16 pm

Original frames are Renold 531....plenty of info online re how to join it.......but note existing frames are 50 plus years old and brazed so serious inspection for internal corrosion needed.......Steve
Steve
69 S2 2+2 (sold) ..Realm C type replica, 1960 xk150fhc

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Series1 Stu
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#23 Re: Advice on engine frame please!

Post by Series1 Stu » Sat Oct 17, 2026 8:35 pm

Reynolds 531 is high tensile steel tubing. You weld it, you weaken it and potentially ruin the structural integrity of the car.

Unfortunately, a lot of people don't understand this and weld it anyway.

At least I know that my engine frames are correct. I wonder how many others can say the same.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Nearing completion
'69 Daimler 420 Sovereign
'93 Jaguar X300 XJR basket case
'93 Audi 80 quatrro Sport

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