Raised Runner 23degree SBC heads Head Hunter

[@Levisnteeshirt1]

Just looked at a 9 degree dart head my pal built in 2012 ,, dirt late model,, the double quench appearance of the chamber really showed how well it was burning the fuel on both sides ,, over 3000 laps on this engine so there was plenty of color to see ,, thanks for what you do

[@flinch622]

All I know about chamber softening is it reduces detonation risk. The pressure wave after ignition beats the flame front in terms of speed, and any points it might bounce and converge after that is where the risk is. Any lean spots in the chamber just amplify the problem. Its complex enough trial & error seems to be the guide: wherever the top land on a piston is cracking off is proof of the chamber area in need of some geometry relief. I'm not a turbo guy so... I don't blow up enough parts to arrive anywhere close to being an expert.

[@hughobrien4139]

I’ve never knowingly ran Ampco 45, have used beryllium copper and moldstar90 quite a bit. In the early days of usage there was a .002” minimum valve guide clearance we were forced to adhere to in our shop. Began noticing that some freshen up jobs coming from other shops seemed to have very little problem with seat life issues. The common denominator was valve guide clearances. Was not uncommon to see .0012” clearance on the exhaust side, no more than .0015”. Even less on the intake side. The harsh reality of that lesson was when we opened those clearances up and suffered the consequences of why our work was not holding up like before. The cars were slowing down sooner and processes were put on the hot seat. It took quite a bit of work keeping our seat cutting processes in line so that concentricity was not a concern. We had a .002 target window diminished down to as little as .0006” (the way we were measuring back then.). P310 gauges I hate. None the less. Those problems went away forever. We even managed to learn a bit about why our top fuel engines were warping exhaust valves so much. It was a game changer for certain. Hope it helps.

[@QXZ9027MKII]

Top notch Sir, much obliged for the insight.

[@timothyarnott3584]

Hey Eric, Time here.......the shape of those ports look wonderful, wish you'd maybe show more short side shape, if camera allowed, but maybe that gets into some of ur proprietary shaping......either way, the shapes look outstanding, and the #'s are just WOW!!!......nice job sir!!!......love the vids!!!....and i'll be waiting for more S-10 tests.......wish u'd take my advice and go with the Mickey ET street R radial, OUTSTANDING drag tire, and performs well for daily driving (blows away the Nitto)...anyhoo, good stuff my brother!!

[@ironmike742]

I don't think he's giving any short side views lol

[@oikkuoek]

Why the pointy lip on both corners of valve seat transitions? Right at the edge of the quench softening, valve seat, combustion chamber and cylinder wall. Assuming they remain inside the combustion chamber, they will create a vortex, and a hot spot on heavy load. These kill port flow, headgaskets, pistons and rods.

[@WeingartnerRacing]

No entirely sure where you are talking but everything is rounded.

[@oikkuoek]

@@WeingartnerRacing There's that tiny lip where the quench softening meets the chamber, 10 o'clock @ intake, 2 o'clock @ exhaust, and vice versa on the next cylinder, and so on. Imo, it doesn't need to be there.

[@WeingartnerRacing]

It’s rounded there and it helps with a lot of things. That’s actually cooler part of chamber. The hotter spot is at the spark plug side. If you grind it out you hurt flow and eliminate the divergent cone of the Venturi from the seat.

[@oikkuoek]

@@WeingartnerRacing I'd still argue it's the other way around. Especially @ lower valve opening, 0.1-0.4 the stream hits the lip causing a vortex disrupting the flow to the cylinder on intake, and a hot spot on exhaust side. And the tip of the lip will get hot on the intake side too. On a 2-valve head, there should be a vortex inside the chamber @ intake cycle, so most of the flow comes from cylinder wall side of the valve. If there's an obstruction right in the middle of it, it hurts the flow.

[@WeingartnerRacing]

@@oikkuoek my results don’t match that statement. The opposite almost. Most flow is the opposite of the cylinder wall. Not having that lip hurts low lift flow from all my testing. The only chambers that don’t have that lip are stock heads. Needles to say they are not good.

[@zAvAvAz]

great work on these heads, great numbers should make some power, and be det resistant. the intake valve is soo big though, i would opt for a larger exhaust valve instead, like 1.69" or 1.72" with a smaller intake valve, could it be done on a street endurance road race head? this one shall be a 6.2" rod 373 c.i. enduro, daily driver, cross country, engine that doesn't pit for fuel until after race is won. The other option is the 6.25" rod 362 c.i.

[@WeingartnerRacing]

Why

[@zAvAvAz]

@@WeingartnerRacing to move air and fuel through really fast at wot and have full control with throttle pedal at part throttle , and control heat, well it shall use berillium exhaust seats, and phospor bronze tubes there. the chamber you did there is really cool, i love it.

[@cfmechanic]

As I was watching I was thinking man that does look very similar to my ported dragonslayers

[@KontoVonMir]

The loss of flow in the short turn area is called reversion.

[@zAvAvAz]

teehehehehehee

[@KontoVonMir]

@@zAvAvAz Would you care to explain why you find that funny?

[@zAvAvAz]

@@KontoVonMir Sure! Its fun about heads and i am find it amusing. And how it was not connected to any particular comment reply or time stamp in the video, as reversion is thought to be known by and as actual reverse flow dynamics, reversion is the act of it. its awesome about heads isn't it :o) teehee hee is a little giggle. have a little giggle then.

[@timrayburn2461]

Thanks Eric

[@Rob94hawk]

Would that chamber softening work for boosted engines?

[@WeingartnerRacing]

Yes it’s recommended

[@rle1020]

On a na max effort build what kind of hp would these heads support? 800?

[@stevegrant6247]

Nice

[@michaelsettle4933]

👍