Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: Richard48Y on Thursday,December 08, 2022, 07:40:24 PM
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I cannot seem to relocate the link for the company that has a variety of beehive valve springs available.
Lots of listings for LS, Coyote, Eco-boost, etc.
So it would seem that finding a more common engine which uses a similar spring may be the simpler answer.
But I have no idea where to begin.
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Ferrea.com maybe?
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Sorry, but what is a Ts head?
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Sorry, but what is a Ts head?
My guess, a Renault 16 TS.
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Cross-Flow, "Hemi", TS, "Gordini" R16/R17.
I probably missed at least one common reference.
Not a true Hemi or Gordini.
Ferrea were no help as these are not common engines anymore.
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Which is good because true hemi heads are inefficient and true Gordini heads were... odd.
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JB
Define odd. A true Hemi has cylinder heads cut completly around from what my machinist says. another member has built a tool for cutting the head in equal cc"s. Remember, I am a novice.
Dakazman
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Gordini had some decidedly odd ideas.
High compression, hemispherical heads lead to long thin combustion chambers. This gives a slow burn (lots of ignition advance needed) so more heat is lost into the piston and head (overheating, pinking, holed pistons). One way to counter this is to twin plug the engine. This greatly shortens the burn time and you can reduce the ignition advance quite a bit (5° to 10°) which also reduces all the bad things above. Finding the space for two plugs can be difficult and Gordini used true hemi chambers. So he made a a small chamber for the spark plug above the combustion chamber. Two small passages led to the combustion chamber. The idea was this would function like a twin plug head. Well, it didn't. Gordini retired/left and Renault took over. They resigned the chamber so it had an aggressive squish area on one side. This created a lot of turbulence which greatly speeds up the burn time. The engine now produced more power and less heat. Win, win and no magic required.
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I have wondered about the effect of radically modifying TS/Crossflow heads to true or near true Hemi configuration.
I see some here have done that but am not sure if they are on the road yet.
My hope is that I will not have to further modify my own TS head.
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Similar to Honda’s CVCC JB?
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Not really as that had a separate feel system to feed a their separate chamber. It basically fired a rich mixture to light an excessively lean mix to end up with an overall lean mix.