289 FIA vintage race engine with Webers

[Karl Bebout]

Would love to hear this raspy little beeeetch both idle and hit 8K. Gotta really bark with that compression

[1795]

Brent and Gary,

Thanks for the input.

Brent, I will pm you when it is time for a refreshing, hopefully that will not be too soon. I understand what you are suggesting. At the same time, As a race car driver (as opposed to the engine builder) I want to go slow and this engine is a big step up in power. I have seen other racers have too much power too early in their development and it stunts their growth and can lead to bad habits, as power can make up for some of a bad line in a corner, but not totally mitigate it. By the time I am able to tame and feel confident with the handling and performance of this engine, I will be ready for your additional HP and torque. I also wanted a cam that would pul in the 4,000-6,000 range as I wanted more power coming out of the corners and was not as concerned with power down the long straights.

Gary,

Looking forward to hearing what you have to say.

I tend to be a sequential person and look to make slow and consistent gains. My race school was with a 120HP Formula Ford, first race car an MGB with 130HP, then increase the HP to 150 with the B. The cobra with about 350HP was a big step up from the B. Now I am ready for that next increase.

Karl,

Here is a link to the engine idling when it was on the engine stand prior to the dyno tuning.

https://youtu.be/LmPoRwlaL1M

Jim

[moar_carbz]

Originally Posted by 1795

Karl,

Here is a link to the engine idling when it was on the engine stand prior to the dyno tuning.

https://youtu.be/LmPoRwlaL1M

Jim

The idle seems surprisingly smooth for a 250@50 cam... but the idle speed does seem high. What's that idle set at?

[1795]

Originally Posted by moar_carbz

The idle seems surprisingly smooth for a 250@50 cam... but the idle speed does seem high. What's that idle set at?

I cannot recall what the idle speed was set at right now. After I ge the engine backing the car and start her up I will let you know. Race engines usually have a high idle speed, as they do not like low idle situations. Most of the time when you are on the grid you are feathering the engine to warm it up before hitting the track.

Jim

[Gaz64]

Originally Posted by moar_carbz

Wow. The intake closed at 86? What was the reversion like?

I'll assume it was evident, but that is a racing F1 engine peaking at around 11000 rpm.

Originally Posted by moar_carbz

The idle seems surprisingly smooth for a 250@50 cam... but the idle speed does seem high. What's that idle set at?

The engine is solid in a framework, so no rocking as such, and no tachometer.

Also exhaust system fitted while on the stand would affect idle quality.

Gary

[moar_carbz]

Originally Posted by Gaz64

The engine is solid in a framework, so no rocking as such, and no tachometer.

Also exhaust system fitted while on the stand would affect idle quality.

Gary

Yeah... not really a noticeable lope though either. If it's idling at 1600 or something I'll attribute some of the smoothness to that.