Lotus Omega/Carlton rebuild

[MIKEoff]

Also gives me a 22mm piston pin in stead of the heavy 24mm original pin.

Look at this pictures:








JE forged pistons with 22mm lightweight or heavy duty wrist pins and high heat ceramic coated crowns and moly coated skirts.
Made special for MUD-Motorsport Russia

[keithcdb]

Monster in the making

[Colonel K]

wow, wow, wow and WOW.

Cant wait to see this come together!

[GeorgeGt]

So you took rods that where ment for nissan and pistons that where ment for some other engine and put them into your custom 3.8 litre lotus engine ? And maschined the pistons to get the CR ratio you need and the ceramic coated ? Interesting. Do you know any good combinations i could use for turbo C30SE engine ? What pistons and rods can be fitted in standard C30SE engine for turbo ?

[spanishfly]

Engine sounds awesome, loving the engineering.

[adaptec]

Originally Posted by GeorgeGt

So you took rods that where ment for nissan

Yes, I did.

Originally Posted by GeorgeGt

and pistons that where ment for some other engine and put them into your custom 3.8 litre lotus engine ? And maschined the pistons to get the CR ratio you need and the ceramic coated ?

No, I got new pistons custom made from Wiseco after my specifications, fitting the Nissan spec rods, my longer stroke, my desired CR etc. The pistons is not coated yet, but I will apply friction coating to the skirts before I assemble the engine. I will not apply ceramic coating on the top because I want the piston to absorb the heat from the combustion to avoid the most heat possible from the cylinder head it self. Why? Because the aluminum in the C30SE/C36GET cylinder heads is very bad and porous and easily cracks. I don't want to destroy my £2,000+ cylinder head.

Originally Posted by GeorgeGt

Do you know any good combinations i could use for turbo C30SE engine ? What pistons and rods can be fitted in standard C30SE engine for turbo ?

For the C30SE we use custom rods and pistons to fit. Use a 10mm longer rod and of course 10mm less CH on the piston. The C30SE responds amazingly to boost. We made a turbo C30SE with a Garrett GT35R, custom inlet manifold, forged bottom end (stock crank), stock cylinder head and got 459whp on 1,6bars of boost. It made 610wNm on 1,9bars. The sound of the engine is just amazing, I think it tops my list of engine sounds. It idles like a Chevy SB and screams like an motorcycle on RPMs. It turns 7500rpm and pulls more and more with more RPM. The stock cams are actually very modest, but the engine just pulls more power with more RPM up to nearly 7000RPM.

[adaptec]

@MikeOff: Nice piston, but I still don't like the shape of the dish. I actually run only a 28cc dish with the piston well above the deck and more stroke. I have a higher CR than original, but I want a decent base CR.

[lee303]

really interesting project, what sort of base cr are you heading for? and how much boost?

[Jack]

I love this car so much already! Will the standard LC diff/shafts...etc take this kind of abuse?

[adaptec]

@lee303: Very close up to 9,0:1. Don't know the boost yet of course, but 1,5-1,8 peak boost perhaps. It's impossible to say before the real mapping.

@Jack: I hope so If not I have to buy upgraded diff and shafts, but they are expensive. I'm not using the LC prop shaft, that one is made new in one-piece carbon fiber. It will take the abuse.

[Twelfty]

this is a cracking build! any more pictures? ill be requiring some video too so i can hear

[vxlgsi]

I have lightweight flywheels for the lotus carlton if you need one, they are 22kg as standard lol

[adaptec]

@vxlgsi: As you can see from the pictures I have made my own (lightweight) flywheel. We also make a lot of steel flywheels for other Vauxhalls and other brands.

[ianofbhills]

Fascinating project i'll be following this and looking forward to seeing the results.


any gen on the combo let too?

[vxlgsi]

Originally Posted by adaptec

@vxlgsi: As you can see from the pictures I have made my own (lightweight) flywheel. We also make a lot of steel flywheels for other Vauxhalls and other brands.

So do i

[adaptec]

Originally Posted by ianofbhills

any gen on the combo let too?

Sorry, that car is dead. Haven't updated my signature.

[adaptec]

Dismantled the front and rear suspension this weekend. Should be sandblasted tomorrow so I can deliver it on powder coating on wednesday. I have all parts brand new for installation when the parts are powder coated so in a week or so the car should be rolling again

Also ordered a Tremec T-56 today. When the front and rear suspension is back mounted I need the engine and tranny inn order to proceed the project. Will keep you posted!

[rc]

wow very impressive plans