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Idea Exchange - 1940s and 1950s Engines

PostPosted: Fri Jan 31, 2014 5:25 am
by geredis
I'm currently working on engines and designs for my company, and figured that I'd go and do things in a more or less chronological order, starting back in 1940 and progressing through time, adding landmark designs every once in a while, then various iterations in between to help fill in these gaps.

I've noticed around here that just about everyone has been making engines with all of the fancy modern technology. not being much of a car buff myself to be honest, or even mechanically minded, I'm not really all that skilled with most of the engineering (my first attempt at a V8, mostly for fun, came out at an underwhelming - I think - 89 HP when I tried to copy a Fiat aeroplane engine from the late teens and early twenties that got nearly double or triple that historically).

Since then I seriously downgraded, and have been toying around with making analog designs from the late 30s and early 40s to get a sense of what works.

For those wondering about my engine, here it is:

Image

For those wondering about the GA1937 393cc, the engine is designed to essentially be an American version of what's in the Citroën 2CV, for GA's Citizen line which is inspired by the Volkswagen, as well as the 2CV itself. Small, underpowered, but cheap and rather reliable, designed for little more than simply getting people on the road.

I can probably make a few changes to the engine I'm sure to cut down on emissions, though from what I've read with how broken the emissions calculations are, it may be best to largely ignore that line.

Comments, critiques, criticisms, perhaps anyone else building engines that have their own pieces from a similar era (of any size, design, or purpose)? I'd love to see what others are doing at the early end of the industry since most are using only the latest and greatest tech in their showcases here it seems.

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Fri Jan 31, 2014 1:17 pm
by MViking
Like you I enjoy playing about in the older years (though mostly in the late 50's to early 80's) and I always enjoy seeing what people make without the modern tech. Your post prompted me to remake my old 2cv esque 500 cc engine in the new build. I made a single carb version on 92 octane and a twin carb sports version ;) on 98 octane. As a note for your engine you might want to tweek compression or timing to use more of your octane rating (I assume your using 92 fuel but your engine is only at 90.7) Also like yours this engine is an early overhead cam for the bit more power then an OHV.

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Fri Jan 31, 2014 2:22 pm
by geredis
They both look awesome - and I may also get around to a sports/premium version of the engine later on.

As for your suggestion to get a little more out of it, your suggestions hit the mark. Tweaking for a richer mixture (13.7) and a slightly earlier ignition (knocked it up a good 10% or so to 55), I was able to get a comfortable 7.6 on the compression (previously I was down around 7.0), as well as just about 15 HP out of it. Which is probably right about where I want it for what I'll be using it for.

I took your advice too after seeing the sport engine, and was able to do decently I think - managed to kick the deluxe version to about 21.8HP, running on 98 premium, sport filters, and a couple other things. I'm currently tweaking the exhaust to keep noise down while managing to pull the last horse or two out of this engine.

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Sat Feb 01, 2014 12:28 am
by Frankschtaldt
Top job chaps.

I tried to duplicate the 2L I6 from the 1940 BMW 328 but can't duplicate the bore x stroke. It has a 66mm bore and a 96mm stroke and the game just won't let you have that big of a difference between them. =(

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Sat Feb 01, 2014 3:03 am
by geredis
thanks, Frank.

Have you considered making a scaled version, or making other modifications to that you get the same results, but in a different way? I also had the issue with the bore/stroke ratios being too limiting (and the actual sliders topping out too early) when I tried, mostly for fun, to recreate the Fiat A20 aeroplane engine that I hinted at earlier. That 6 inch stroke on a 4.5 inch bore was appealing in a way...but very frustrating to try and work around.

On the one hand, I like that the game gives us such restrictions - helps make it easier to troubleshoot our engines...on the other hand, having such restrictions can be vexing in your case, or mine.

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Sat Feb 01, 2014 8:07 am
by Frankschtaldt
geredis wrote:thanks, Frank.

Have you considered making a scaled version, or making other modifications to that you get the same results, but in a different way? I also had the issue with the bore/stroke ratios being too limiting (and the actual sliders topping out too early) when I tried, mostly for fun, to recreate the Fiat A20 aeroplane engine that I hinted at earlier. That 6 inch stroke on a 4.5 inch bore was appealing in a way...but very frustrating to try and work around.

On the one hand, I like that the game gives us such restrictions - helps make it easier to troubleshoot our engines...on the other hand, having such restrictions can be vexing in your case, or mine.



Totally! I can understand why there would be such limitations given the game is still a fairly early beta.
I would hope that by launch though some of these limits would be eased a bit.

I did make an "as close as I can get it" version but the bore was bigger and the stroke shorter and it just annoyed me HAHAHA.
I did manage to get pretty close to the original engines figures though.

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Mon Feb 03, 2014 8:28 pm
by xABSOLUTIONx
i just can't do small engines :mrgreen:

here's my idea of a roadlegal sports engine for a BMW inspired coupe/convertible

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Thu Feb 06, 2014 1:37 pm
by MViking
Your engine looks more like it would have come out of an Alpha type company with the dual cams that early on. You could probably squeeze just a touch more out of it with timing adjustment because you have a little ron to play with (assuming you are running 92 if its 98 up the compression and timing a lot to use it). The other thing is the man hours are going to make it cost a bit. Might have to have a go at a few bigger engines myself now :)

Re: Idea Exchange - 1940s and 1950s Engines

PostPosted: Sun Feb 09, 2014 9:01 am
by xABSOLUTIONx
nah it's running 92

and i'm planing on making a TVR/Caterham/Lotus type company

small production numbers, but very respectable in the racing scene