Originally Posted by Darth_V8r

I can photograph about 64% of the car...

Attachment 709334

Originally Posted by 01CamaroSSTx

Are you planning on using E85 with this build?

Originally Posted by Darth_V8r

No, but I may have to. I had used a different ramp rate than what these particular lobes actually use, so instead of a DCR of 8.73 where I thought I was, it is 8.99. I'm using boostane for home-made 95-proof fuel, but I'm starting to think E85 is inevitable. The issue is that there isn't a gas station nearby that I can tell has it. And I don't want to drive 20 miles one way to get it. And I really don't want to have to rerun my entire fuel system for it. There is a sunoco nearby, and I'll be swinging by to see if they offer 99. I'm really excited to finally be on the downhill slope.

Pushrods ordered. I got 2@6.633, 8@6.642, 5 @ 6.660, 1@ 6.686. I also ordered one extra of the three smaller sizes just in case. I think I mentioned it in an earlier post, but this way, even if a rocker comes loose, i'll end up around .020 hot lash worst case scenario. Maybe a tad noisier until I can readjust it, but no other harm.

I also got the new HRB in, so if I get time today, I'll be getting all those measurements and setting up the HRB. Tilton 6000. My stock one came out in pieces. I have driven lazer's with the tilton 6000, and it is so much the nicer vs the stock hrb.

Originally Posted by bortous

Good work.
With a dynamic compression ratio of 9:5.1 E85 will be required won't it?
That's what mine is at.

Originally Posted by Darth_V8r

You SURE you are at 9.5??? You would be 13-14 static to get 9.5 dynamic. When you calculate dcr, use the 006 lift numbers not of 050 lift numbers.

Edit - I just looked at your OP. 12.5. So if you only have your 050 numbers, with the lobes you have, add 23 degrees to your IVC to get your 006 number. The ramp rate on your cam I think is going to be 46 degrees. You should end up with a number near 77 abdc for your IVC. This will drop your dcr to the 8.3-8.7 range. Sorry for not being more specific. I am doing the math in my head.

Originally Posted by bortous

All good Darth.
This is the calculator I'm using:

https://www.gofastmath.com/Compressi...tio_Calculator

It asks for the IVC at .050.
So are you correct or me?

Originally Posted by Darth_V8r

Neither. The calculator is wrong to ask for the 050 events, BUT I thought you were using low lash solids, not full on solids. So, after I got back to a computer, I redid the math:

Your cam is full solid, but as I said, I thought it was low lash solid. I just went through your thread and found your cam card. Your ramp rates are only 27 degrees. Uses the .020 durations of 283/290. But you set your lash at .014 per the cam card. So, the actual IVC is 71.5. With a 12.46 static compression, you are at 9.41 dynamic.

I made an incorrect assumption regarding your ramp rates. The online calculator you used is incorrect to use the .050 valve events.

Originally Posted by bortous

I thought my camshaft is a low lash?

Originally Posted by Tuskyz28

Just curious.... what clutch setup you going with this go around ?

Originally Posted by Darth_V8r

Not a low lash. Call it a "mid-lash" for lack of a better term

The less lash you run, the lower your DCR will be. The only way to accurately calculate it (if you don't run .014 hot) will be to put a dial indicator on the valve after you set your lash, rotate the motor, and find your .006 event. Use that empirically determined IVC to calculate DCR. The only real difference is that iron and steel will expand and contract almost the exact same rate. Meaning your block and pushrods will stay the same relative to each other. Only the aluminum heads will grow faster than the pushrods and impact lash as the engine warms up or cools down. Likely only 0.002 difference between hot and cold lash. Aluminum, you kind of count on .010 increased lash due to the aluminum expansion with heat outpacing the pushrods. In other words, the pushrods get relatively shorter as the engine warms up.

Yes, the comp street version appears to have more aggressive ramp rates. But, that is a good thing in terms of idle quality and light throttle / low rpm drivability. Don't be alarmed by it. From .200 lift through peak lift, I do not know which is going to be more aggressive.

Yes, I would think so. Alternately, you'd be buying up barrels of specialty fuels like CHP at higher prices.

Originally Posted by Darth_V8r

Imma stick with the RPS. It has outlasted two motors (but three top ends) now, two transmissions, a rear axle, and a driveshaft, and still within .003" of the measurements when I installed it! I am concerned this new motor will finally overpower it, but I'll give it a chance to prove me wrong before I ditch it.

Being real, it's been one of the best upgrades to the car. Drives great, holds power, light, and durable. It has so far been worth every penny.

Originally Posted by bortous

I think Navy mentioned something about this being a medium lash solid.
I am not worried at all.
I was just curious about it.
However, I know comp usually has the more aggressive lobes going by the past trends.
Cam motion also tell me they have a more aggressive LLSR lobe that requires minimum 170lb seat pressure vs 140-150 for their standard offering.
So my engine will need E85 after all then.

Thanks for breaking that down.

Originally Posted by Darth_V8r

no problem. sorry about the bad guesses on that one post.