Renault Engine Building tips

[Ultimaguy476]

Those look like my rockers on the R8. Who’s car is that?  I’m not sure I would recognize the name but I’m guessing i sold them to him. Same color, same design...

[GavinT]

Yeah, they do look like yours.
I've lost track of who did it. I really only stole the pics and made a few notes for myself.

[MRN I J]

I wonder whether it would also be feasable to make the 5 transverse pillars in alloy aswell, get rid of even more weight.
I will also be using alloy Nikasil coated liners  in the 807 engine, I had them made over 30 years ago now for lightness, more even cooling amonst other things.

[jbcollier]

Also, would need less liner projection.

[MRN I J]

alloy liners possibly 12 lbs off engine weight,
that along with alloy front hubs, alloy front calipers, alloy radiator, plastic high performance fan, alloy water pipes, alloy gearchange, alloy sump & baffle (which is heavier) S1 doors & S1 lexan windows, alloy Banks style hinge kits, single skin engine cover, 4 revolution wheels, alloy fuel tank (Banks ones constantly split)  & anything else I can discard
on the + side
front oil cooler mounted in the left front wheel arch with 2 full length cooler pipes
all makes for a light car

[Ultimaguy476]

My 82.5mm liners weigh 1.38 lbs each....all four= 5.52lbs. 
Kinda hard to justify much weight reduction there. 
And the added power more than makes up for all the weight reductions you mentioned.
Even I can't imagine a enough weight being lost in the five transverse valve train mounts to make it worth it.....unless they are fairly cheap....in which case, me wants.
The most noticable weight reduction you mentioned is the wheels, but the revolution wheels don't hold a candle to a spun aluminum wheel.  I run 10" wide rears and 9" wide front (13") Bogart racing wheels and I can't imagine a lighter wheel.  Along with the Hoosier road racing slicks, they almost float.  I'll weigh one and include it in my next post.
It's all about either rotating mass  or unsprung weight for speed....total weight for cornering. 
I spend my money on power, lowering rotating mass and unsprung weight.  Aluminum flywheel with 200mm clutch for now.
Even made titanium push rods once but the guy spun them too thin at the cup and one broke.  I should have more made because that was really light. 
What I don't really know is how the titanium will either wear or cause wear at the cup and ball interface.  Anyone want to chime in on that?

[Ultimaguy476]

Clutch assembly. 

On the shelf, I have a semi lightened steel flywheel that weighs 16.9lbs.  Add a 200 mm clutch and the weight is just under 30 lbs.

In my car, and also on my shelf, is a fidanza flywheel that weighs in at just over 7 lbs.  Already a rotating mass weight reduction of 10 lbs.

A while back, I bought a Tilton 5 1/2" 3 disc clutch assembly on ebay for around $200.  Put that on the Fidanza and the total weight is just over  12 lbs.

And the Tilton is much smaller diameter, so all things considered, this will reduce rotating mass dramatically. 

I will likely have to spend some money getting discs with the correct splines and having the flywheel modified to take the Tilton hub.

But then I will lose the weight of the 215mm renault steel hub currently on the flywheel....total weight under 12lbs.

And it will go in using the stock throwout bearing setup.

[Ultimaguy476]

Wheels:

Here are some pics of one of my Bogart front wheels on the scale. 

I can't imagine a lighter setup.

[Richard48Y]

Three piece?
Reminds me of when I used to buy Compomotive for P4's and Ultima's.
Too bad Compomotive is either out of business or no longer doing three piece wheels.
They used to be the only way to get the correct off-set and width.

[Ultimaguy476]

Estey, three piece. Any offset, any width.
Around $300 each last i bought

[MRN I J]

1 bought 3 sets of Revolution for £450 a set, 30 years ago they were the best period rims available as they started making them in the very early 70s, Image wheels make good 3 piece rims https://www.imagewheels.co.uk/
still too expensive for me.

My 78mm liners weigh 15oz's, if they were a larger bore they would weigh less obviously, although your engine gives good power it give far greater torque than my 1600cc engine will at lower rpm, I got 150 at the flywheel fairly easily with little proper tuning years ago, a Salv race cam, vernier cam sprocket, mild porting, std valves, std valve springs, std pistons & liners,std rods, std crank, std flywheel, std clutch, twin 45 Dellorto's, exhaust manifold & system.

[Ultimaguy476]

I’m confused.  Your post said alloy liners possibly 12 lbs off engine weight??

[MRN I J]

I’m confused.  Your post said alloy liners possibly 12 lbs off engine weight??

just a guess, however I measured an alloy liner when I made the breakfast this morning, I had 5 made as you never have 4 liners or pistons made, the spare sits in my home office.
I'll go to my storage area next week and weigh a CI liner

[Ultimaguy476]

You have my interest.  Can you post a picture of your liner?  Cost?  Where did you get yours?
I'm not so concerned with the weight as I am with, from my 5 minutes of sleuthing, the heat transfer.
What is the longevity of a alloy liners?
I see they are coated with a material because the aluminum would never hold up to ring abrasion.  I was thinking ceramic but it wouldn't seal well.  What do you know of the coating material?

[TurboFource]

Motorcycles have used sprayed/coated cylinder bores for decades.....