Classic Trans-AM / Touring Car challenge!

[Rossriders]

Here's my two entries for under 2000 and over 2000.

Under 2000

TA under 2000 ver 3.png (909.81 KiB) Viewed 4771 times

For under, I went with an OHC design and made the engine 1.8L, I did this since I saw in theory and in practice that a simpler valve train setup would be more durable compared to something more complicated. That and I didn't want the engine to be too heavy.

For over 2000, I pushed things a bit but well...take a look yourself.

TAover2000 ver 2.png (925.01 KiB) Viewed 4771 times

So...any thoughts?

[gt1cooper]

Here's my two entries for under 2000 and over 2000.
So...any thoughts?

If I might make a couple tips.

What I found with such a limiting hour requirement is that single exhaust is better. GIve it a shot. Even if you need to use exhaust bypass valves (Like I did) it will require less hours for the same power. However, you will have to watch the loudness, so you may have to use baffled instead of straight through, when you WILL have to use the bypass valves to get the power. Either way, you save hours.

For extra hours, I found these to be the priorities for quality sliders:
1. Fuel system (Lots of MTBF and RON)
2. Top end (Power and MTBF)
3. Bottom end (MTBF)
4. Exhaust (Basically loudness only)

You will be surprised at the importance of the fuel system. It allows you to get another 100-200 RPM out of the engine (Edit: Importance is that it is relatively cheap compared to bottom end), allowing you to use a much bigger cam, allowing you to get more power.

[mtm84]

I do believe that 1 hp will make all the difference. hopefully its worth the 11 torqs.

5000cc 66 transam.jpg (191.16 KiB) Viewed 4754 times

I actually would have preferred something more sensible for 1966, but that HP target was just too high.

[edit]
And the 2 liter class:

2000cc 66 transam.jpg (198.1 KiB) Viewed 4754 times

[Rossriders]

Here's my two entries for under 2000 and over 2000.
So...any thoughts?

If I might make a couple tips.

What I found with such a limiting hour requirement is that single exhaust is better. GIve it a shot. Even if you need to use exhaust bypass valves (Like I did) it will require less hours for the same power. However, you will have to watch the loudness, so you may have to use baffled instead of straight through, when you WILL have to use the bypass valves to get the power. Either way, you save hours.

For extra hours, I found these to be the priorities for quality sliders:
1. Fuel system (Lots of MTBF and RON)
2. Top end (Power and MTBF)
3. Bottom end (MTBF)
4. Exhaust (Basically loudness only)

You will be surprised at the importance of the fuel system. It allows you to get another 100-200 RPM out of the engine, allowing you to use a much bigger cam, allowing you to get more power.

The tips are apprecieated, even though a lot of this, I'm actually aware of. I suppose a reason why I'm trying to go for simplicity over power (more so compared to other entries with power far above my own) was an aim for a higher MTBF. It's a reason why for both engines, at some point I kept hitting walls since I did actually try (more) tweaking with the sliders, but kept going over the allowed limit.

It has dawn on me that being a bit stubborn with sticking more with OHV, or Direct acting OHC and at most SOHC is likely a major limitation since obviously a lot more power could be drawn by going DOHC and with a 4 or 5 valve setup. Although as it's probably already been stated and something I've known for years, going for say a 5L DOHC motor compared to an OHV motor means among other things (besides potentially having a much larger engine size overall) is how much heavier a similarly displaced motor of a pushrod design.

One among others I have experimented with has been putting more emphasis on cylinder stroke than bore but while it allowed a lighter engine, it naturally opened up another problem of decreasing MTBFs.

I'll just keep at it when I can...that said, here's a revised over 2000 motor, and I'll get to the under 2000 when I can.

over2000trans-am2.png (942.82 KiB) Viewed 4742 times

[nialloftara]

Is there any interest in turning this into a racing series? I can't enter as the update doesn't like my computer for some reason but I could write up some full car rules and make a leader board in the general chat thread.

[OCAdam]

I'd try to race, but uh... before any real racing series can get underway, we need tracks. So far I've only coded up Road Atlanta (needs optimizations and a better track picture), and Bristol Motor Speedway (no track picture at all even started!).

[nialloftara]

We will need tracks but we can use the current test track as a dialing in point to help fine tune the specifications and cars.

[OCAdam]

Oh yeah, that'll be the best way... though airfield or automation track? Personally I think the airfield track makes more sense to test for cars to run on race track-like courses while still giving a nice amount of turn types to conquer and tweak for rule sets.

[Junny]

Thought I'd contribute. Both my engines are pretty generic so nothing to stand out.

Under 2000cc


5000cc had to throw some fuel at it to get the MTBF up =S

[gt1cooper]

I do believe that 1 hp will make all the difference. hopefully its worth the 11 torqs.

5000cc 66 transam.jpg

Sorry, I won't let this stand

I updated my engine, still above 26000 miles, without losing much torque and getting, now, 482 HP

Have fun guys!

[mtm84]

Still 1 HP ahead

5000cc 66 transam.jpg (190.47 KiB) Viewed 4567 times

[gt1cooper]

But I am more responsive, torquier, and more efficient

Edit: Updated mine. Matched his horsepower and bettered his torque, efficiency, and responsiveness. Increased both torque and horsepower by 1.

I just realized how much this is like the 60s, a true engine battle Good job nialloftara, you've made me have the best tuned engine I've ever built

By the way, I also built a body a la the Shelby Daytona. Niall, do you want to make a thread in the car forum for trans am/le mans cars like the Shelby, the GT350R, the Camaro, or shall I?

[mtm84]

I honestly dont know where I can go from here. But you are still 1cc over

[gt1cooper]

Shhhhhhhh... They're ok with it! Trust me, no need to make an issue... maybe I can convince you not to? If I post my engine download in this thread?

[mtm84]

Nah its fine. I can go 1 CC over too and it still wont get me ahead haha.