Budget '69 Camaro Track Car - NO WHINERS!

[Track Junky]

Originally Posted by Sieg

Nice catch.

GC - What changed that would influence the pressure or pressure numbers?

I just got off the phone with Joe. If you look at coolant temps they are alot cooler on the first dyno. Cooler temps will give you higher pressures......on the same note the pressures shown on the second dyno sheet do make me a bit weary but Joe assured me that if there was an issue he would have caught it and that if I was running this way before most likely nothing has changed on the bottom end. Especially after 23 pulls with consistent readings and power.
T-Hill will be the ultimate test on this motor this weekend as weather has been forecasted for 100 plus temperatures.

[Track Junky]

Originally Posted by Vince@MSperfab

with RPM, my gut is telling me oil pump clearences.

After this season its gonna get gone through again.

Gae, when you dyno'ed what filter was used and was the bypass in the block?

Cant remember brand of filter and yes the bypass was in.

[Sieg]

Originally Posted by Vince@MSperfab

with RPM, my gut is telling me oil pump clearances.

After this season its gonna get gone through again.

Gae, when you dyno'ed what filter was used and was the bypass in the block?

Originally Posted by Track Junky

I just got off the phone with Joe. If you look at coolant temps they are alot cooler on the first dyno. Cooler temps will give you higher pressures......on the same note the pressures shown on the second dyno sheet do make me a bit weary but Joe assured me that if there was an issue he would have caught it and that if I was running this way before most likely nothing has changed on the bottom end. Especially after 23 pulls with consistent readings and power.
T-Hill will be the ultimate test on this motor this weekend as weather has been forecasted for 100 plus temperatures.

Makes sense on both counts.

[intocarss]

Originally Posted by Track Junky

I was wondering about that myself. Not sure why the oil pressures look so much better on the first dyno sheet.

Did you change pushrods, pan, p/u and lifters? I too think that 45 psi is a little low on a road race eng @ that RPM, just remember


"Oil pressure and oil volume are 2 different things. As long as the oil supply gets where it needs to go at a given pressure, more pressure is just more strain on components"

[Track Junky]

Originally Posted by intocarss

Did you change pushrods, pan, p/u and lifters? I too think that 45 psi is a little low on a road race eng @ that RPM, just remember


"Oil pressure and oil volume are 2 different things. As long as the oil supply gets where it needs to go at a given pressure, more pressure is just more strain on components"

I changed pushrods and pan. Pan was the same one as I had last time so I didn't change p/u.

I'm going to run the temps up as soon as it dries up outside and see how the pressures look.

[intocarss]

Originally Posted by Track Junky

I changed pushrods and pan. Pan was the same one as I had last time so I didn't change p/u.

I'm going to run the temps up as soon as it dries up outside and see how the pressures look.

Don't forget that gauges can read differently too + you can't read volume on a gauge.. Just keep an eye on it. A lot of people like to pull the pan after a dyno and read the bearings, I know it's a pain, but you may want to take a look at the bearings that will tell you a lot. , your dyno guy knows his stuff, I'd say you're safe.

I know you know...change the filter it's easy and cheap. Hope it's not a FRAM We had a lot of problems with those after that Co took Fram over. Switch brands if it is I like K&N or Wixs or get a reuesable filter like a systems 1 or?? I had an oberg I liked it, I took it apart and had a look all the time

[Track Junky]

Running a System One adapter and remote filter system with 12 an lines. I agree.....pressures look low and they even seem lower on the gauge than before. Theres only one thing I can think of right now that would have changed that and it would be pan to p/u clearance. Not sure why that would have changed though.
I'm just going to have to take it easy on the track the first couple of sessions and just watch the oil pressure gauge. I'm going to ask Dave to let me run in a slower group for the first couple of sessions.

[Flash68]

So how did Joe try total timing at on your latest dyno session? How high did he go before reverting back to 32.5?

That is a huge difference to go from 37 to 32.5 for a 23* head. Timing is largely based on the efficiency of the head's combustion chamber, but you did not change heads, so I am confused.

I don't think I've seen a 23* head with such low total timing.

[Vegas69]

What is being done to control windage? Are you running a windage tray? Have you tried dropping the oil level say a quart?

I wouldn't even race it until you figure it out. Losing 15 lbs of oil pressure from 3000 to 6500 rpm means you have a serious issue. With an oil temp of only 174 on the dyno, it's going to be worse on the track. Especially if it's a windage issue which it almost certainly has to be.

Oil pressure should climb with rpm.

[Vince@Meanstreets]

thanks Todd, we'll look into it and report what we find.

Im going to speak to Joe and Gaetano later. I want to find out what oil was being used and the level. The level may have been incorrect.