3.8 Engine rebuild
#121
My Lucas data base shows:
Both 3.4 & 3.8 CR 9:1 1966 Jaguar with 22D6 # 41064A distributor, with a {5/12/8} vacuum unit.
Give these guys a call, for recommendations on best distributor specs, for your compression ratio and fuel octane available.
They can overhaul and update your distributor for your planned configuration/application.
British Vacuum Unit
Canterbury, NH 03224
(603) 731-1788
For orders or info, use our web "Contact Us" or email us direct at
https://www.britishvacuumunit.com/lu...ibutors-1.html
This thread addresses some options:
https://www.jaguarforums.com/forum/x...xj6-s2-250183/
Rgds
David
Both 3.4 & 3.8 CR 9:1 1966 Jaguar with 22D6 # 41064A distributor, with a {5/12/8} vacuum unit.
Give these guys a call, for recommendations on best distributor specs, for your compression ratio and fuel octane available.
They can overhaul and update your distributor for your planned configuration/application.
British Vacuum Unit
Canterbury, NH 03224
(603) 731-1788
For orders or info, use our web "Contact Us" or email us direct at
https://www.britishvacuumunit.com/lu...ibutors-1.html
This thread addresses some options:
https://www.jaguarforums.com/forum/x...xj6-s2-250183/
Rgds
David
Last edited by David84XJ6; 05-03-2024 at 03:21 PM.
#122
Join Date: Jul 2012
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8 to 1 CR = Lucas 22D6 ~ 41063A ~ on all 3 of the cars I had to restore my S Type. Monster Lucas Data Base .pdf that is too large to attach here shows the same. Seems the different CR has a different advance curve. (Another Service Manual mistake)
Last edited by Glyn M Ruck; 05-04-2024 at 02:46 PM.
#123
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#124
There no vacuum ports on the intake or carbs. I prefer not to drill any holes to add a vacuum port. Unfortunately, I haven't found many distributors without a vacuum advance. Mechanical advance only distributors have a different advance curve.
Is there a specific reason why some engines came with mechanical advance only?
Is there a specific reason why some engines came with mechanical advance only?
#125
There no vacuum ports on the intake or carbs. I prefer not to drill any holes to add a vacuum port. Unfortunately, I haven't found many distributors without a vacuum advance. Mechanical advance only distributors have a different advance curve.
Is there a specific reason why some engines came with mechanical advance only?
Is there a specific reason why some engines came with mechanical advance only?
( Tailored advance curve for optimal performance and drivability)
Amazon price $285.00 Added matching coil Pertronix 45011 Flame-Thrower II 45,000 Volt 0.6 ohm Coil , Black price: $62
or (a Lucas DLB198 ignition coil, price $42 Moss Motors)
Note: you must use Electronic Ignition spark plug wires. Any Parts store can supply correct wire sets, if you ask for 1984 XJ6 S3 jaguar wire set.
I have not heard anyone comment on this unit, many Jaguar owner are happy with the Vacuum advance version. I installed Vacuum version on my 1968 XKE and it worked well. The Lucas distributor I removed was non-vacuum; It was a smog distributorto deal with lean burning at all RPMs, and like the carburetors were made to be tamperproof.
Rgds
David
Last edited by David84XJ6; 05-04-2024 at 06:11 PM.
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Glyn M Ruck (05-05-2024)
#126
Moss 4 Speed Dip Stick
My Moss 4 speed has a what looks like a threaded hole in the top cover. The manual shows a small dipstick in the exploded view of the gearbox. Is this hole for a dipstick? Did they all have a dipstick? There is a threaded hole in the side of the main case for a plug, I assume that you fill the transmission to that level.
#127
#128
Moss 4 speed lubricant
I've been researching oil for a Moss 4 speed. It's a little confusing, some say it must be a GL4 oil, all GL4 I've found is multi-weight, like 80w-90 gear lube. Other's have stated not to use multi-weight oil. Moss sells Redline MT-90 for manuals. Some post state specifically not to use synthetic oils, Redline is a full synthetic oil.
What is a proper lubricant for a Moss 4 speed with white metal?
What is a proper lubricant for a Moss 4 speed with white metal?
#129
#130
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#132
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#133
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#134
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#135
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#136
3.4 spark plugs heat range
I'm looking for spark plugs for a 3.4. It's bored .030 with a "B" type head, 8:1 compression and 2 SU HD6 carbs. What would be the correct heat range for 88-91 octane fuel? Champion shows a heat range from 6-9 for engines with a "C" type head, no listing for a "B" type head.
Last edited by jayd2; 05-09-2024 at 06:15 PM.
#137
3.4 approximate HP
My 3.4 is bored .030 with a "B" type head and 2 SU HD6 carbs. Are there several cams that can be used with a "B" head? Is there a significant HP difference between the cams? I've seen 3.4 HP ratings from around 160 to over 200HP. What's approximate HP range with the "B" head?
#138
#139
I'm looking for spark plugs for a 3.4. It's bored .030 with a "B" type head, 8:1 compression and 2 SU HD6 carbs. What would be the correct heat range for 88-91 octane fuel? Champion shows a heat range from 6-9 for engines with a "C" type head, no listing for a "B" type head.
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David84XJ6 (05-10-2024)
#140
My 3.4 is bored .030 with a "B" type head and 2 SU HD6 carbs. Are there several cams that can be used with a "B" head? Is there a significant HP difference between the cams? I've seen 3.4 HP ratings from around 160 to over 200HP. What's approximate HP range with the "B" head?
The power ratings then were gross, not net like is used now, and some of them were rather optimistic. I have tested my 3.8 with an actual compression of 8.6 and I measured 164 hp.
Some of the XK120, Mark VII, XK140 and Mark 1 2.4 had 5/16" lift cams, and the later engines all the way to 1992 has 3/8" lift cams. An engine from a Mark 1 3.4 should be 3/8" lift.
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Glyn M Ruck (05-10-2024)