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Re: Lets talk a little more about quench [Re: coronet1966d] #483146 09/30/09 11:08 AM 09/30/09 11:08 AM
Joined: Nov 2008 Posts: 671 Wisconsin USA B Bill MeLater mopar
Bill MeLater mopar B Joined: Nov 2008 Posts: 671 Wisconsin USA	They are actually Speed pro 2355's, were flat tops w/ 4 valve reliefs. I cut 'em for valve clearance and compression. If I remember correctly they are 14 cc's now.

Re: Lets talk a little more about quench [Re: Bill MeLater] #483147 09/30/09 11:45 AM 09/30/09 11:45 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	wow i didnt know you could cut that much out of them. how big of a cam were you running to need to cut that big of a valve relief?

Re: Lets talk a little more about quench [Re: coronet1966d] #483148 09/30/09 03:59 PM 09/30/09 03:59 PM
Joined: Nov 2008 Posts: 671 Wisconsin USA B Bill MeLater mopar
Bill MeLater mopar B Joined: Nov 2008 Posts: 671 Wisconsin USA	The crowns were over .300 at the reliefs so theres pleanty of room to cut. Minimum thickness according to speed pro is .180, I still have over .220. I'm running .579 lift with 2.14/1.88 valves so the radial clearance was really tight. Had to unshroud the cylinder walls to clear the exhaust valves also. If you build what you're talking about you won't be dissapointed. Just watch where you "cut corners"

Re: Lets talk a little more about quench [Re: 360view] #483149 10/03/09 12:49 PM 10/03/09 12:49 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Good point about piston wall clearance and varying metal expansion ratios. For factory engines in daily driver vehicles instead of race engines, what about wear with mileage ? Let's just assume that a new & well assembled engine with attention paid to each cylinder individually will hit at 0.025 at 5500 rpm. What would be people's guesses as to how much increased head to crown clearance is necessary to avoid hitting at 5500 rpm when the engine ages to, say 50,000 miles ? 100,000 miles? 200,000 miles ? Related question: does a head gasket compress a wee bit more with additional years and tighten effective quench ... or does it relax instead and increase quench clearance for the worse? THis is a corollary to my previous post. Modern factory engines have a number of, well for lack of a better word, tricks in them to resolve these questions. thinner, moly faced rings, specific cylinder wall finishes, specific piston to wall clearnces, specific ring land specifications, etc. All to run nice tight quench, control excess oil into the combustion chamber, and so on. Which is why our old school engines are somewhagt expensive to setup right. Heck, today's production line maching is on par with the expensive race shop machine work of not so long ago. Bubba at the local machine and horseshoe shop cannot match it. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Lets talk a little more about quench [Re: Supercuda] #483150 10/03/09 01:07 PM 10/03/09 01:07 PM
Joined: Sep 2009 Posts: 172 Mooresville, NC I Intense RT Dan member
Intense RT Dan member I Joined: Sep 2009 Posts: 172 Mooresville, NC	Any good and reputable shop can and will automatically do this quality of work. Will you have to pay more? Probably so but in a package deal I can't see it running much more. You can run tight quench with loose pistons also. If they are a good shop they will use a dial indicator on a bridge and rock the piston and take the average in and out of the hole, go to opposite side (outboard or vice versa), and do the same. I had to do this on my build. Then you you surface the deck of the block to get it where you want. May have to do that a couple time, get it close, then make a final cleanup pass. It just takes attention to detail and pride in workmanship.

Re: Lets talk a little more about quench [Re: Intense RT Dan] #483151 10/03/09 01:18 PM 10/03/09 01:18 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I am shooting for .040" and milling each piston top till I get it perfect (in addition to the deck milling) which is why I'm going w floating pins so I can mock it up as many times as I need to till it's right. live every 24 hour block of time like it's your last day on earth

Re: Lets talk a little more about quench [Re: RapidRobert] #483152 10/03/09 01:34 PM 10/03/09 01:34 PM
Joined: Sep 2009 Posts: 172 Mooresville, NC I Intense RT Dan member
Intense RT Dan member I Joined: Sep 2009 Posts: 172 Mooresville, NC	Quote: I am shooting for .040" and milling each piston top till I get it perfect (in addition to the deck milling) which is why I'm going w floating pins so I can mock it up as many times as I need to till it's right. That's the way to go.

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