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Jaguar Performance Engines

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24.01.2022 Another nice 4.2 E Type head about to go on. Bigger 1 7/8 inlet (up from the standard 1 3/4) valves fitted, new RBR stainless and nitrided inlet and exhaust valves, new hardened seats, new bronze valve guides, new valve springs, inlet ports reshaped to suit the larger seats and away we go! All run of the mill stuff that we have been doing for over 20 years, gives an extra 15hp at the rear wheels on PULP with no other mods. We carry all parts on the shelf.

24.01.2022 This looks pretty wild!

21.01.2022 Haven’t spent much time in the engine room of late but just finished this XK120 engine and have a line up of engines now to build. Captions below the pics.

17.01.2022 Getting ready to build the next one. 3.8 with some really good gear!

16.01.2022 We recently finished some work on this 4.2 E Type. It came in for a service and valve clearance adjustment - pretty standard stuff. So I removed the cam covers ...and checked the clearances and on number 1 and 4 inlet, no clearance at all and some others had too much clearance, but it’s the ones with no clearance that caused the concern. So out with the cam and followers to find cracked collets that had pulled up the valve stem, ready to pop off if the owner had given it a rev. So head off. But no so easy. It took two of us a day to get it off as it was corroded solid onto the studs, common for a V12 but not so much on a 6 cylinder. No coolant in the engine at all and so much corrosion. Then on dismantling, whoever built the head had sunk the valves so far into the seats that they then needed to grind down the shims really thin, then tipped the valves to get clearance. Bad corrosion in the water galleries too. So new seats, valves, guides, retainers, colletts, followers, cam bearings. Welded water galleries and re machined. New head studs too. Repaint in the correct gold, polish all the alloy and she is now all good to go for a long time. Big job, considering what it came in for. Not cheap. All because the owner had someone rebuild the head who didn’t know what they were doing and whoever was servicing it didn’t care for the cooling system by running coolant. There are lessons in there! See more

15.01.2022 Last two engines for the year, both series 1 4.2 E Type’s. One finished and ready for the dyno, the other bottom end done just waiting on the head and will be completed in January. Then I have some interesting engines to build: 1. A 420 engine that is going into an XK150 that we are restoring. Triple Weber’s, our usual CNC porting, rod/piston design, cam and exhaust combo. Will make 340hp with a 5 speed behind it. The car will have other upgrades to handle it!... 2. A 4.2 E Type engine for road and track use. A bit more comp than the above engine and will make 350hp. 3. A 4.2 E Type engine for a Lightweight, same combo as above again, but this one with Jenvey Heritage throttle body injection and MOTEC. 4. A 3.8 E Type engine for a roadster that we are restoring. 5. An early 3.8 E Type engine for a flat floor roadster we are restoring. 6. A 3.8 XK150S engine for a roadster we are restoring. 7. A 3.4 XK120 engine with nice forged pistons, CNC ported head, nice cams and twin sandcast SU’s. Same engine that I built for my XK120 and aiming for 300hp. 8. Another 3.8 E Type engine for a coupe that we are restoring. So over Christmas I’m making some changes in the engine room and renovating to make some more space and storage. Happy days!

14.01.2022 V12’s galore. From left to right, XJC as removed from the car. Series 3 E Type times two and on the right another XJC but a serious one. More below each pic below.

12.01.2022 This why you change your oil and coolant regularly. Have a look at the sludge and the sediment in this XK120 engine.

11.01.2022 This one is a little bit different, although using tried and proven components in tried and proven combinations! More next week on this one.

07.01.2022 Just getting started on this early XK120 engine as a part of a full restoration we are doing on the car. The car was dismantled in 1970 and has sat dismantled ever since. The head was removed and not stored very well. Check out the pics. Lots of corrosion but we can save it. The car is totally numbers matching so important to save the head. Lots of modifications to this car and to the engine. Isky cams, big valves and sandcast carbs are all a part of it. We stock everything. I’ll update as we progress and detail the Restoration, modification and build of the engine.

06.01.2022 Following on from my last post which was the internals of an engine that I wrote was a little bit different, here are pics of the completed engine. Different in that it is a 420 short stud engine with the 420 straight port head but is going into an XK150, so XK150 sump and oil filter housing. The bottom end internals are in the last post, the head is CNC ported, really nice custom valves, all new retainers, bucket retainers and I selected a cam profile that best suits what t...he customer wanted - an easy car to drive with lots of torque but aiming for 330hp. Redline Weber manifold with a lot of work done to it (as they do) and new 45DCOE Weber’s. Classic Fabs short manifold system which I knows works best with the cams I chose. Pro Race balancer, Fidanza alloy flywheel and AP diaphragm clutch. Bosch electronic ignition with an MSD amplifier with rev limiter set at 6500rpm, alloy water pump, braided cam feed line, ARP head studs and nuts and nifty oil filler cap! Customer requested we paint the head red for something different, so this is the correct red as used in a C Type head. Ended up with 336hp with 36mm chokes, probably more there with 38mm chokes but drive ability is important. See more