A Question of XK Engine Sizes
#1
A Question of XK Engine Sizes
Hello All.
Was at a garage today & they had an XK140 FHC being restored. Having a quick glance at the engine block next to the car, noticed it had "3 1/2 Litre" embossed on the side! Took a closer look & it definately said "3 1/2 Litre" (the half written as a fraction, not ".5").
Just out of curiosity, did Jaguar make a 3.5 Ltr XK engine???
Was at a garage today & they had an XK140 FHC being restored. Having a quick glance at the engine block next to the car, noticed it had "3 1/2 Litre" embossed on the side! Took a closer look & it definately said "3 1/2 Litre" (the half written as a fraction, not ".5").
Just out of curiosity, did Jaguar make a 3.5 Ltr XK engine???
#2
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#4
The Jaguar Mark 4 saloon and also the Mark V had the Standard Motor Co. 3.5 litre pushrod engine or the smaller 2.5 litre fitted. There was also a 1.7 litre 4-cylinder as well, up to 1948. Jaguar purchased the production machinery for the Standard engines after WW2, before that they were supplied by Standard. The XK engine started off as a 3.4, then came the 2.4, 3.8 and finally the 4.2. The XK was double overhead cam, of course, not pushrod, and very advanced for its year, as side valve engines were still in widespread use.
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Glyn M Ruck (07-22-2020)
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S-Type Owner (07-23-2020)
#7
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#8
As Glyn stated the 3.4 was actually 3442cc .
The 3.8 was 3781cc.
The 2.4 was 2483cc
The 4.2 was 4235cc
It appears the rounded the figures up or down to the nearest point and then stamped that into the side of the block.
Question though when you rebore your engine from standard to +30, +60 or +90 thou pistons how much more CCs are you getting. Does anyone have the mathematical skills or access to a guide that would tell you what CC you now had. I had my 3.4 bored out to +90 and have always wondered what CC I now have?
The 3.8 was 3781cc.
The 2.4 was 2483cc
The 4.2 was 4235cc
It appears the rounded the figures up or down to the nearest point and then stamped that into the side of the block.
Question though when you rebore your engine from standard to +30, +60 or +90 thou pistons how much more CCs are you getting. Does anyone have the mathematical skills or access to a guide that would tell you what CC you now had. I had my 3.4 bored out to +90 and have always wondered what CC I now have?
#10
Quick calcs suggest:
Cylinders bored out 20 thou = 3.48 Ltrs
Cylinders bored out 30 thou = 3.50 Ltrs
Cylinders bored out 40 thou = 3.53 Ltrs
Cylinders bored out 50 thou = 3.56 Ltrs
Cylinders bored out 90 thou = 3.63 Ltrs
(Assumes:
Nominal Stroke = 106 mm
Nominal Bore = 83mm,
Nominal Capacity = 3441 cc)
Cylinders bored out 20 thou = 3.48 Ltrs
Cylinders bored out 30 thou = 3.50 Ltrs
Cylinders bored out 40 thou = 3.53 Ltrs
Cylinders bored out 50 thou = 3.56 Ltrs
Cylinders bored out 90 thou = 3.63 Ltrs
(Assumes:
Nominal Stroke = 106 mm
Nominal Bore = 83mm,
Nominal Capacity = 3441 cc)
#11
Quick calcs suggest:
Cylinders bored out 20 thou = 3.48 Ltrs
Cylinders bored out 30 thou = 3.50 Ltrs
Cylinders bored out 40 thou = 3.53 Ltrs
Cylinders bored out 50 thou = 3.56 Ltrs
Cylinders bored out 90 thou = 3.63 Ltrs
(Assumes:
Nominal Stroke = 106 mm
Nominal Bore = 83mm,
Nominal Capacity = 3441 cc)
Cylinders bored out 20 thou = 3.48 Ltrs
Cylinders bored out 30 thou = 3.50 Ltrs
Cylinders bored out 40 thou = 3.53 Ltrs
Cylinders bored out 50 thou = 3.56 Ltrs
Cylinders bored out 90 thou = 3.63 Ltrs
(Assumes:
Nominal Stroke = 106 mm
Nominal Bore = 83mm,
Nominal Capacity = 3441 cc)
Yep +90 Jeff as it said it on the box and who am I to argue. I don't lie about these things you know just state the facts.
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JeffR1 (07-23-2020)
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Glyn M Ruck (07-23-2020)
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If you fit liners. Been done quite often. As Fraser mentions 3.8's have always had liners.
Last edited by Glyn M Ruck; 07-23-2020 at 06:52 PM.
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To amplify Frazer's point.
All production 3.8 XK engines came from the factory with cylinder liners made from Brivadium, an alloy developed by Bristol for its sleeve valve aircraft engines. It is one of their best features.
Maximum rebore permitted + 30 thou after which new liners should be fitted.
All production 3.8 XK engines came from the factory with cylinder liners made from Brivadium, an alloy developed by Bristol for its sleeve valve aircraft engines. It is one of their best features.
Maximum rebore permitted + 30 thou after which new liners should be fitted.
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littlelic69 (07-26-2020)
#17
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Glyn M Ruck (03-20-2021)
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