Conrod length on 1995cc motors

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FiatRally
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Re: Conrod length on 1995cc motors

Post by FiatRally » Mon Feb 08, 2016 8:51 am

Mr Croft and TMVolumex,

Thank you so much for all the information and advise.

It is clear that the cost does not warrant any further investigation on the Fiat TC engine.

Money would be much better spent on the correct pistons and conrods.

Then - to build it to the GC spec and fit the correct accessories to ensure it is a rugged and a long lasting engine.

I am satisfied that the experience gained from my thoughts would be futile and a total waste of time and money.

I will work on what we have and make sure it is put together properly with the correct preparation as per your instructions.

Thank you very much for the help.
GC_75

Rallyroller
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Re: Conrod length on 1995cc motors

Post by Rallyroller » Tue Feb 09, 2016 3:36 pm

Hi All

I am reading this with interest as an engineer and enthusiast. I will never get into building an engine of my own like this however I do like the level of information.

I would just like to throw a couple of general comments in. Certainly modern production techniques are now at a level that allow very complex materials to be used in your “average” car engine. My job (for over 30 years) involves visiting car engine and gearbox plants globally, and the comparison of the technology in materials as well as in production tollerances between 1980 and now has to be seen to be believed. Certainly with the quest for better emissions has caused the progress in development of materials. With very accurate production process for machining and heat treatment, most parts today are of a very high standard. ( Well perhaps not in the USA- but their cars are cheap!)

You only have to look at automatic gearboxes- now up to 9 and 11 speed- in the size of a casing previously used for 3 speed in the 80’s and capable of handling much higher torque.

Anyway – I do have a question. A few years ago ( 4 actually) I was servicing for a French guy on the Roger Albert Clark rally ( Yes he was in a 124 Spider). Anyway- on the rally was an Austin Healy 3000 from Holland. It was entered by a chap over there who rebuilds these cars for racing and rallying. I was talking to him and we got into a discussion on old technology verse new technology, and cost of development.

He said that he looked for a modern piston from a reputable supplier/manufacturer that was suitable ( with a small amount of modification) and then had con rods made to suite. ( I think he said the ones used in the Healey’s were Opel. ) He said generally it was easier to get a rod made to your spec than a piston. I assume this is technically possible – what do you think?

I suspect if you contact the piston manufacturers directly then they will know which of their “standard” pistons is near to what is required for your “special” and can easily advise on which they can modify most easily for your requirements. I doubt they design a new piston for every specialist that calls them. Also if they have all the drawings on cad, then they can alter things and the machine just makes it!.

I suppose with all of this, the easiest ( for most people) would be just to drop another modern engine into your car- However- if that was the case then you could take it one step further and just buy a new car. Thank unacceptable you guys are out there, keeping engineering and classic car ownership alive and well.
GC_13

Guy Croft
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Re: Conrod length on 1995cc motors

Post by Guy Croft » Tue Feb 09, 2016 7:20 pm

"I suspect if you contact the piston manufacturers directly then they will know which of their “standard” pistons is near to what is required for your “special” and can easily advise on which they can modify most easily for your requirements. I doubt they design a new piston for every specialist that calls them. Also if they have all the drawings on cad, then they can alter things and the machine just makes it..."


haha, nice try..

if only it was that simple!!

G
Guy Croft, owner

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