Lotus Twincam Engine Modifications

[Matt Elan]

Thanks for doing this Rohan - thats my bedtime reading sorted!
Matt

[rgh0]

Back from my holiday in Europe and managed to finish Chapter 8 - Building a good breathing cylinder head. See the attached PDF file below

Chapter 8 Building a good breathing cylinder head.pdf

(1.63 MiB) Downloaded 332 times

Now I need to finish chapter 9 about all the ancillaries that need to be considered to ensure your modified engine is reliable while finshing my current engine build and before I do some Skiing in Australia and head back to Europe for some more summer...... I am enjoying my retirement

cheers
Rohan

[Andy8421]

Rohan,

Thanks again for all this. Required reading for anyone thinking of rebuilding a twinc.

Andy.

[skelteanema]

Thanks Rohan, a great resource. Have enjoyed reading each chapter.

[h20hamelan]

good clip on valve float

https://www.youtube.com/watch?v=_REQ1PUM0rY&t=20s

though I wonder if it keeps the valve seats clean no carbon buildup eh

[nmauduit]

thank you so much Rohan for sharing and taking the time to put your experience down in a widely useable form !

a great help to keep the spirit alive...

[rgh0]

Does anyone in this Forum got any informations about IWR camprofiles ?

I have a nice pair IWR 155 cams - 11,1mm lift - 7/16" camlift

Best regards , Roger

I have never seen details but given the lift and age of the cam it will probably be a long duration of about 310 to 320 degrees seat to seat and only usuable in a full race engine

cheers
Rohan

[LCRJ]

Hi Roger,

Yes, I'm interested in IWR and doing research on it.
IWR had four type of cams for Lotus TC.
155 is stage3 race cams.
.433 lift 58/89/89/58
So duration will be 327
Clearlance(cold) in 7thou ex 10thou

Have a nice holidays!
Hiro

[rgh0]

Hi Hiro
where did you find the details on the IWR engines. I would be interested to understand more about the details of their modifications back in the 60's and 70's

cheers
Rohan

[LCRJ]

Hi Rohan,

I sent PM.

Kind wishes,
Hiro

[rgh0]

I have posted a copy of the Feb 24 version completed file to my one drive account. The link below will give you access so you can download it.

https://1drv.ms/f/s!AoF1R127qyczgrlv141 ... g?e=bz6oeI

I am exploring options to make it avaiable in printed form at cost for those who like a physical book

cheers
Rohan

[UAB807F]

Thanks for making the PDF available, I've downloaded it and am amazed at how much detail you've packed in there. Stunning work.

Having read your previous files I reckon that a print-on-demand would work. It's probably a smaller market than we all think but there's so much information in there that anyone serious about building their own engine is going to want a copy. It's a bit like Miles' book, it sits on the shelf for years and then suddenly you need it.

If you do get a deal to print on demand I'll cross post the link on to the Europa forum & io group as well.

Brian

[rgh0]

Yes its going to be a small specialist market and I am not looking to make money on it. But there were about 40,000 Twincams made and not many of them are still totally standard!.

I would like a copy on my shelf also so i will sell at least 1 . The Amazon print to order option does not seem too difficult and i will work through that as i get time. Just need to design a good cover page and do all the other bits they want added.

cheers
Rohan

[Baggy2]

But there were about 40,000 Twincams made and not many of them are still totally standard!.

I think mine is !
Seriously though I'd like to add my thanks to the many heading your way not only for the 'book' but all your contributions to the forum - always good humoured unlike some ! There should be a forum rating higher than the five gears - maybe a gold star!

[promotor]

Yes its going to be a small specialist market and I am not looking to make money on it. But there were about 40,000 Twincams made and not many of them are still totally standard!.

I would like a copy on my shelf also so i will sell at least 1 . The Amazon print to order option does not seem too difficult and i will work through that as i get time. Just need to design a good cover page and do all the other bits they want added.

cheers
Rohan

Thankyou for sharing this Rohan, and well done, it's great information all in one resource! I look forward to hearing progress being made on a printed version and the process of how you go about such a thing!

Regards.