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| my heads - I'm letting the cat out of the bag (Page 1/2) |
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lou_dias
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SEP 28, 12:56 PM
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I thought I was getting a good port job for my new motor ... until I pulled my current/old heads to compare.
Now I'll have to transfer the new valve train over. Bigger 1.8/1.5 valves vs Fiero Store SI 1.72/1.42 valves.[This message has been edited by lou_dias (edited 09-28-2021).]
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Patrick
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SEP 28, 02:47 PM
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| quote | Originally posted by lou_dias:
[youtub]https...
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YouTub is only for bathing videos. 
You don't sound too pleased in the video! 
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lou_dias
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SEP 28, 03:33 PM
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Notorio
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SEP 28, 11:34 PM
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Do the larger valves require new valve seats or did the shop machine the old ones??
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lou_dias
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SEP 29, 07:46 AM
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Ah crap, I had actually had them done last year but everything has been delayed. I wanna say they were machined but I honestly can't remember.
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Spadesluck
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SEP 29, 10:06 PM
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Sucks, take them back and get it done properly or get some money back?
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lou_dias
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OCT 01, 03:12 PM
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| quote | Originally posted by Spadesluck:
Sucks, take them back and get it done properly or get some money back? |
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Not worth it. I am having the engine machine shop clean up the old heads and see how much work it is to transfer over the new vavles+springs, etc...
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Blacktree
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OCT 02, 04:01 PM
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I'm going to play devil's advocate for a moment. Have you flow tested the heads? You can't tell how much a head will flow, just by looking at it. Bigger isn't always better. If it was that easy to determine the performance potential of a head, we wouldn't need flow benches.
That said, the port job does look amateurish. Also, the inconsistent port sizes don't inspire confidence.
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lou_dias
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OCT 03, 05:17 PM
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| quote | Originally posted by Blacktree:
I'm going to play devil's advocate for a moment. Have you flow tested the heads? You can't tell how much a head will flow, just by looking at it. Bigger isn't always better. If it was that easy to determine the performance potential of a head, we wouldn't need flow benches.
That said, the port job does look amateurish. Also, the inconsistent port sizes don't inspire confidence. |
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Not worth it on the 'new' heads and ...
Because flow #'s don't mean anything to me. Water doesn't compress and it doesn't like changing direction. Air don't care. Yes - you can hashtag that: #airdontcare
My heads are proven performers. I don't need to prove them to anyone else. I post my dyno results. No theory there. Just results. You can watch my last 6 years of racing to see what they've done against arguably the toughest oval track around. Been getting crazy exotics there lately as well and they all get smoked. Most recently a Viper... This year the track has gotten drivers to come up from NY, NJ, NH and Maine. Our local/regular guys beat them all. Now one of our top competitors is gonna try to make an appearance at the Freedom Factory's 'spectaor drags'.
My dyno results themselves are stunted because I don't put on street wheels/tires on to go to the dyno. I just leave my heavy 17x10s on... So the 'real' #'s are higher but again, I don't care - I'm just making sure my a/f ratio is good with the occasional timing tweak. I share what I do because I believe information should be shared... I built upon the 3.4 modders before me just like I perhaps inspired La Fiera to go even farther.[This message has been edited by lou_dias (edited 10-03-2021).]
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Will
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OCT 04, 07:13 PM
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| quote | Originally posted by lou_dias:
Not worth it on the 'new' heads and ...
Because flow #'s don't mean anything to me. Water doesn't compress and it doesn't like changing direction. Air don't care. Yes - you can hashtag that: #airdontcare
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https://en.wikipedia.org/wiki/Compressible_flow
| quote | | flows are usually treated as being incompressible when the Mach number (the ratio of the speed of the flow to the speed of sound) is smaller than 0.3 (since the density change due to velocity is about 5% in that case). |
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