Peer pressure and the OHV - Page 4 - Performance Forum

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Re: Peer pressure and the OHV
Thursday, July 19, 2007 11:08 PM
Torque plate huh? Good luck...




fortune cookie say: better a delay than a disaster

Re: Peer pressure and the OHV
Wednesday, September 19, 2007 5:41 PM
so any progress yet ..... ive got my engien tore a part and am designing it as we speek ...



Re: Peer pressure and the OHV
Wednesday, September 19, 2007 8:43 PM
Naah... sorry. I'm working on it, though.

-->Slow
Re: Peer pressure and the OHV
Wednesday, September 26, 2007 11:33 PM
slow, My 2.2 build is intended for roundy-round. I'm very interested in talking to the guy about rod/piston combos and the rules for his class. That is a great power figure n/a and I'm impressed to say the least. Can I have his email addy or maybe you can give him mine to talk about some ideas. Great info, thanks, tbd.

"Power to the Pushrod"
Re: Peer pressure and the OHV
Thursday, September 27, 2007 4:33 AM
He's told me he's using Eagle rods for the LN2. They're about $300 / set and I believe they're listed as 5.590" long.

I don't know of anyone else using the I6 rods that I'm going to use, but that doesn't mean I'm the first. Eagle sells rods for an I6 Chevy which might be a good choice for your engine. As far as pistons, I'm sure you're already planning to buy a custom set. I've spent sooo many hours looking for ready made pistons from any make and model that it's not even funny.

Posted rules:

-->Slow
Re: Peer pressure and the OHV
Thursday, September 27, 2007 8:20 AM
Thanks, slow. Does the guy run dirt or asphalt? The area I race at has some of the top 4cyl tech around for our rule package. I was wondering if he runs carb or PFI. Curiosity killed the cat and I'm about to fall over, lol. Later, and good luck on your build, tbd.


"Power to the Pushrod"
Re: Peer pressure and the OHV
Thursday, September 27, 2007 4:53 PM
Dirt,
PFI,
Current top car in standings is an OBDII car, #2 is a 95, both are running LN2's with custom tuning.

Hmmm... did the link for the track rules fall off the last post? Looks like it did.
http://www.deerfieldraceway.com/ExtremeProCompRules.htm

HTH
-->Slow
Re: Peer pressure and the OHV
Friday, October 26, 2007 3:42 AM
Seems like the right time to post here.

We're just about through our latest two month inspection period at the shop so things may be slowing down a little, which would give me time to get back to this. I have measured the overall weight of the rods on a postage scale but the scale only reads in 5 gram increments. The inline 6 rods are measuring between 560 and 575 grams each while the stock OHV rod weighs 550g. I don't have a proper fixture here for weighing large / small ends. I'll have to see if I can use the equipment at the machine shop or build something here at the house.

I also managed to score some new parts:

There's 17 of these little gems in this box. They fit 10mm studs which should cut down on the cost of the roller rocker conversion. And as soon as I finish typing this, I'm going to start filling out piston spec sheets for another round of price quotes just in case someone has raised or lowered their prices.

-->Slow
Re: Peer pressure and the OHV
Saturday, January 10, 2009 5:14 PM
Well, I've finally gotten the cylinder head back from the head shop. Seems like measuring head flow might be somewhat subjective. I do have numbers, but they don't seem to jive with what I'm seeing from other heads. These numbers are for intake flow only, as I was told that exhaust flow was at least 75% of intake flow, so generating additional numbers is redundant. This is what happens when you go to see a guy that's been doing this type of work longer than you've been alive... he's developed his own methods. Testing was done using an unmolested head with stock valves and my head with oversize valves, throat cut to appropriate diameter, and three angle valve job. In the chart, sf = stock head flow and mf = modified head flow in CFM. Here's the numbers:


Lift sf @5"hg mf@5"hg sf@28"hg mf@28"hg
.100 86.95 96.20 178.25 227.99
.200 107.30 120.25 254.30 284.99
.300 129.50 138.75 306.91 328.83
.400 140.60 148.00 333.22 350.76
.500 144.30 151.7 341.99 359.52
.600 --- 151.88 --- 359.55


When I asked how these numbers compared to an engine or a head I was more familiar with, He said "If these heads were on a v8 it would easily make 400-500 hp. You'll get 200-250 with no problem." Well, so be it. Overall he was relatively impressed with the flow of both heads but especially the large valve version. If anyone has any insights about the large differences between these numbers and and many other posted numbers for any other heads, I'd love to hear 'em. I was hoping to post some numbers that could be easily compared, but it looks like I've got to spend a bunch of time learning about flow bench testing instead. <sigh>

-->Slow
Re: Peer pressure and the OHV
Saturday, January 10, 2009 5:40 PM
Interesting. I've always wanted to see you finish up your projects.





Re: Peer pressure and the OHV
Saturday, January 10, 2009 6:09 PM
I'm sure you've already seen it, but if not, here's JucedZ4/Dan's flow chart:
It doesn't list how many inches the test was done at though. Dan might be able to get you that info.







Re: Peer pressure and the OHV
Saturday, January 10, 2009 8:55 PM
I had that chart but I didn't know who the source was. I must have merged that chart with another. Mine also lists flow for a ported Patriot Performance head.


Lift I Flow Patriot E Flow Patriot
0.050 43 27
0.100 72 50
0.150 99 75
0.200 125 95
0.250 145 112
0.300 165 124
0.350 179 139
0.400 192 151
0.450 202 156


I'll send Dan a note and see if I can get the pressure differential.
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