on2

iTrader: (4)

Will this combination of PRC Stage 2.5 5.3 59cc milled heads + TR 224-114 (224/224 .563/.563 114 LSA) camshaft + 0.040" Cometic head gasket work without flycutting the pistons?

I know it will eventually come down to my own application and that I will have to measure it myself, but I want to know if anyone has done this before or knows if this will be an issue or not.

I also tried searching but could not find any threads on this combination. I also tried searching on how to calculate PTV but could not find.

Thanks

Oh and what would my DCR be?

Nimitz87

iTrader: (17)

do a search for the DCR calculator....its pretty easy to use.

about PTV, Im no expert but my buddy is running milled 2.5 PRC's .040 gaskets and a 233/239 cam w/o flycutting and it clears. by how much im not sure...

I would think the 224 would clear no problems....

MrDavid

iTrader: (11)

with 59cc chambers, you should have no problem with PTV since your cam is only .563 max lift.

00 Freak

iTrader: (34)

from what i heard it's not the lift your looking it's the duration of the cam to consider about flycutting or not. But i know there's a few ppl on here that has had no problems.

on2

iTrader: (4)

Thanks for the quick replies.

Fifedogg

iTrader: (15)

You should be fine. There are a few people on here with close to that same setup that havn't needed flycutting.

MrDavid

iTrader: (11)

Thats a new one on me. I definantly don't claim to be a LS1 expert but I was under the impression that "lift" will control how low your valves will open and "duration" will control how long they stay open. correct me if i'm wrong.

on2

iTrader: (4)

That's what I thought.

I tried some dynamic compression ratio calculators found on google.

http://www.wallaceracing.com/dynamic-cr.php

What do I put in for ABDC?

Number of Cylinders : 8
Bore in Inches : 3.898
Stroke in Inches : 3.622
Rod Length in Inches : 6.125
Static Compression Ratio : 11.6 (:1) (that's what I calculated from running 59cc + 0.040" HG)
Inlet Valve Closes ABDC : ??º
Boost Pressure in PSI : 0
Target Altitude : 0(Feet)

I get high DCR numbers when I use these calculators. What am I doing wrong?

PBMFIsMe

iTrader: (5)

DCR would be around 8.93:1 IF there is no advance ground in.

Wow.


Edit: That would be with an XFI lobe...sorry. More like 8.77:1 with the TR224

MrDavid

iTrader: (11)

I'm not sure what kind of calculator TSP uses, but they were able to tell me what my DCR would be when I told them the setup I was planning. Give them a call if you want and they may be able to help.