Elite 1975 engine upgrade / cylinder head swap

[PabloRS]

Hi everyone!

I want some engine upgrade, hope You can help and share your expirience.

I have 1975 elite with 907 engine. 

I want to upgrade cylinder head and do other upgrade for top of the engine.

Im not looking for competition set up but for some increase power about 20+ and more smooth torque characteristics and overall better engine performance like: good start, reliability ect. 

I dont want to rebuild engine block and go for 2,2 and do turbo cause it looks out of my budget. 

Compresion is: 12; 12,8; 11,3; 11,2 (bar). Engine was cold when checked and 3 and 4 cylinder have spark thread issue to solve so it might be better. 

Fuel presure is: 1,2 bar (before carb)

Exhaust diamension is: first bigger one 1 1/2 ” after spliting each 1”.

1. What are the pros and cons of lotus Exel 180Hp cylinder head direct swap to standard 907 engine ? Is it a good idea ?
2. Any ideas for 907 Cylinder head rebuild? Not like huge budget but my friend  do so some metal working on sport cars so he may help if needed.
3. Is there anything worth doing with carbs components appart from rebuild and good setup?
4. Is there any resonable option for upgrading ingition system?
5. Any thing more to take care regarding top of the engine?

 

Thanks for help.

Paul

[tom kilner]

Good luck Paul I'm sure you've read this:

https://www.google.com/url?q=http://www.lotusbits.com/improving_your_lotus.pdf&sa=U&ved=2ahUKEwj7soXW06zgAhVVrHEKHbYPAZcQFjAHegQIBxAB&usg=AOvVaw0TmDQJB3AANSj2PlzcaOXp

 

[PabloRS]

I did so I know exel cams are better but but I still dont know if only for 2,2 internals or for 2,0 as well...

and if Yes what would be the benefit. 

[Clive59]

Your fuel pressure is way too high for carbs, should be 3-4psi(0.25bar approx).

Electronic ignition is very easy. No power increase but easier starting and smoother.

Excel HC had different tri-jet carbs as well.

Good luck with your project

[EXCEL V8]

I think you would get better performance/drive-ability by leaving the head as standard and going to 2.2l with 104 cams and Excel SE pistons.  Still wouldn't be too costly if you buy good used parts.

Where do you live?

Pete 

[mikeeech]

You could skip electronic ignition and go straight to coil packs, and ecu with a 3d map

[PabloRS]

19 hours ago, EXCEL V8 said:

I think you would get better performance/drive-ability by leaving the head as standard and going to 2.2l with 104 cams and Excel SE pistons. 

Where do you live?

Can I swich to 104 cams without changing the valves, valves springs, buckets, ect?

Can I instal exel se  pistons without changing crankshaft and con rods?

I live in Warsaw Poland, but visiting UK often.