Engine mounts Se4

PostPost by: prezoom » Sat Aug 11, 2018 11:06 pm

As above, also same as Austin Healey and Jaguar transmission mounts.
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PostPost by: William2 » Sun Aug 12, 2018 9:43 am

I have to say that I can't think of any logical reason why Dellorto carbs have to be canted over at an angle. Surely they were designed to ideally run with the fuel level horizontal in the float chambers??
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PostPost by: alan.barker » Sun Aug 12, 2018 10:22 am

Dellorto or Weber it's the same Engine Mount.
Stromberg don't use the Special higher Mount but they need the Bonnet Bulge/Hump.
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PostPost by: [email protected] » Sun Aug 12, 2018 11:30 am

To Alan
Maybe they didn't change the mould(s) as that would mean taking them out of production for a couple a days with commensurate loss of production schedules etc. Also this would add directly to production cost, as opposed to getting the supplier to supply a different spec, if I have understood Chapman correctly that would be at no extra cost!
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PostPost by: alan.barker » Sun Aug 12, 2018 12:24 pm

True,
but the first Twin Cams had Weber carbs which have the same retraints/needs as Dellorto Carbs.
To have a special Engine Mount made and supplied would still take time. Plus a special mount specific to Lotus will always cost more without an end.
Surely to change the Lug on the Chassis would have been more cost effective. For sure the angle of the Stromberg Inlet Tracts would have been designed to suit.
I imagine the idea in 1963 of fitting Stroms to the Head was not even imagined.
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PostPost by: RichardHawkins » Sun Aug 12, 2018 4:14 pm

I have always thought that the unequal engine mounts are due to "cock up". There are many better ways of altering the angle as mentioned above. From my industrial experience most such strange/unexplainable features were due to design errors that needed to be rectified. After all the components had been made and purchased, someone on the shop floor would tell his supervisor that the thing could not be put together. Usually a bit of head scratching would come up with a solution that avoided telling the boss and didn't get anyone into trouble.

To find out more it would be interesting to know if other twin cam engined cars such as Cortina and Escort have different mounts on either side. Do any of us have such a car for comparison?

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PostPost by: alan.barker » Sun Aug 12, 2018 4:27 pm

I had a 1968 Cortina Twin Cam and don't remember the mounts being different.

If it was a "cock up" at Lotus then i would like to know who "pulled the wool over Chunkys eyes" :?
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PostPost by: Chancer » Sun Aug 12, 2018 8:33 pm

RichardHawkins wrote:From my industrial experience most such strange/unexplainable features were due to design errors that needed to be rectified. After all the components had been made and purchased, someone on the shop floor would tell his supervisor that the thing could not be put together. Usually a bit of head scratching would come up with a solution that avoided telling the boss and didn't get anyone into trouble.


Spot on.

Regarding the showboating boss man, I bet he never got willingly involved in minutia like that and these sort of things usually get saved up by enemies to use against the division responsable as ammunition in a later battle.
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PostPost by: [email protected] » Sun Aug 12, 2018 9:28 pm

Back to the engine count, given the distance that the cards extend over the footwell, I can't see how the carbs were fitted until after the body was dropped on. I think the engine cant is primarily to give hand clearance for the back carb lower nut / thackeray washer etc to be fitted
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PostPost by: alan.barker » Mon Aug 13, 2018 3:54 am

+1 and to stop contact between the Airbox Backplate and top of Footwell. On my Sprint there is a worn groove on top of the Footwell and part of the Flange on the Back Plate is worn away. Because the wrong Engine Mount had been fitted causing contact :shock: . Once i had fitted the special Carb side Mount there was no problem. Someone had fitted the same Mount on both sides which is logical but not the lotus way of doing things :wink:
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