Good Quench Article

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RustyRatRod said:
I know this subject has been beat to death at times, but since I found a cylinder head that has quench possibilities for a slant six, I thought I'd do some reading. This is among the best articles I found. Thought it was a goodun.

Quench: Unlocking Performance Squished Between the Piston and Head
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Agree with all of it except the hemi part . The sides of the hemi piston is where the quench is at , not the bottom of the piston .
And on a superstock hemi , we couldn`t go above 36 degrees very far w/o killing power . I had jacked around with it at the dragstrip , went up to 42 and slowed it down about 2-3 tenths . Was A 10.25 (SUPOSEDLY) engine w. a 785 lift cam dynamics cam in it , worked pretty darn good .
The pistons just kept the carbo cleaned off at 7000 rpm, Tom Hoover told me it was just right , as long as it didn`t break anything, ran for more or less 10 yrs like that .
 
What the HEY!!!! I thought (from the title) that this was going to be about drinking beer!!!!!!!:mob::realcrazy::soapbox:
 
That’s a pretty good article, but I skimmed through it real quick. I’ll sit down and read it all tonight.

One thing I didn’t see addressed in the article (could have missed it because I was doing my best Evelyn Wood speed) was how fuel affects quench. The burn rate of different fuels can change quench requirements.

Pump gas and/or high RPM race fuels have a much quicker burn rate than low RPM fuels.

Pump gas has a pretty quick burn rate because the RPM is usually low and you are trying to burn all the fuel you can, in the least amount.

High RPM fuels need a real quick burn rate (in most cases) because there is less time to burn the fuel, and if you use a “slow” fuel, you end up with a bunch of timing in it, which increases negative work, which kills power.

That’s why quench needs to be a thought out part of an engine build and not just get the piston as close to the head as possible. Just like raising the compression ratio, which increases the burn rate, quench does the same...so a relatively high CR on pump gas and right quench may require a reduction in timing so far that the EGT is through the roof.

It’s a balance and not a one size fits all detail.
 
Covers the basics and a lot of good points. Overall I must read for anyone who is wanting to understand quench style combustion chamber.
 
I didn't post this to dig up "even more" quench discussion. There's enough of that to choke a horse. I just posted it for information. Yall have at it. LOL
 
Killer6 said:
Oh, here's where I bring up Somender Singh grooves, enjoy! Lol!
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Unusual concept. That introduces sharp edges. I've always been of the thought reducing them was better. Not something I'll try anyway, so.......

It is interesting, though. Fo sho.
 
I don't think the Singh grooves have to have sharp edges..............
 
RustyRatRod said:
All of the pictures of them I have seen so far do.
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The very edge at the pad/deck can be broken with some abrasive/fine files w/o affecting it's effectiveness. My biggest misgiving with the technique is the reality that; no matter the velocity generated, I don't believe the groove can remain free of carbon long enough to be effective for but a small fraction of a decent engine's lifespan,...thus not making it worth the trouble.
 
Killer6 said:
The very edge at the pad/deck can be broken with some abrasive/fine files w/o affecting it's effectiveness. My biggest misgiving with the technique is the reality that; no matter the velocity generated, I don't believe the groove can remain free of carbon long enough to be effective for but a small fraction of a decent engine's lifespan,...thus not making it worth the trouble.
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There's always the age old trick of dumping water down the carburetor. LOL
 
Regularly scheduled steam-cleanings might work, after opening the idle screws up, having an asst. hold 'er at 3K, hosing the carb w/copious amounts of carbclean, pausing every 5-10secs to slam the choke shut, You know...the good ole' days!
 
Killer6 said:
Regularly scheduled steam-cleanings might work, after opening the idle screws up, having an asst. hold 'er at 3K, hosing the carb w/copious amounts of carbclean, pausing every 5-10secs to slam the choke shut, You know...the good ole' days!
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It worked! There's no denying that.
 
I love how a commentor chimed in with a "smarter people than You say squish ain't all that" chirp at that article, lol! Guess all those heads flowing no more air or even less, but put out anywhere from 5-20% more oats are all just dumb lucky SOB's! Lol!
 
Killer6 said:
I love how a commentor chimed in with a "smarter people than You say squish ain't all that" chirp at that article, lol! Guess all those heads flowing no more air or even less, but put out anywhere from 5-20% more oats are all just dumb lucky SOB's! Lol!
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Yeah. There was a member over on the .org site pissin on my thread about the closed chamber head I put over there talkin about it wouldn't make any more power. I guess he missed the picture of the long rod short block it's going on that's gonna have .043 knocked off the block for zero deck height. lol He's a regular over here spoutin off his nonsense too. That said, power wasn't the reason I was looking for. I was lookin for the properties of quench that help run on lower octane and that cannot be denied. Course I'm sure some will still argue. lol
 
remember the old Carter "water injection"? JCWhitney used to sell em..... I tried it once in the hottest part of a summer.
and on vehicles that I've had to replace head gaskets on, once the head is off you could tell where it was blown, the affected cylinder was the cleanest..... sometimes can tell just by pulling the plugs out too and looking at the business end of em
 
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volaredon said:
remember the old Carter "water injection"? JCWhitney used to sell em..... I tried it once in the hottest part of a summer.
and on vehicles that I've had to replace head gaskets on, once the head is off you could tell where it was blown, the affected cylinder was the cleanest..... sometimes can tell just by pulling the plugs out too and looking at the business end of em
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Yeah, many times I've wished that head gaskets would fail a little on all cylinders, I hate seeing 1 or 2 steam-cleaned chambers/pistons, 'cause I feel compelled to try & get the rest as clean! Just did a set on neighbor's '09 Torrent,...ok, straying from RRR's subject, back to quench/squish..
 
Killer6 said:
Yeah, many times I've wished that head gaskets would fail a little on all cylinders, I hate seeing 1 or 2 steam-cleaned chambers/pistons, 'cause I feel compelled to try & get the rest as clean! Just did a set on neighbor's '09 Torrent,...ok, straying from RRR's subject, back to quench/squish..
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Hay I ain't picky. It's all relevant. lol
 
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