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Re: Considerations on pistons in a 360 engine.
[Re: Moparbil]
#424072
08/04/09 12:12 AM
08/04/09 12:12 AM
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Joined: Oct 2007
Posts: 3,884
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,884
Oregon
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Quote:
I have checked up a litle on what "quench" is.
There is something which is still not clear to me.
It depends on if you're using closed chamber, or open chamber heads. Also most gaskets will say what its' compressed thickness is.
Closed chamber, the head is flat, the piston is flat, stick a 0.040 head gasket between them, boom, you're done. (the valve reliefs allow you to have a sane compression ratio)
Open chamber, put clay on the top of the piston, bolt it together, crank it around, take it apart, measure the clay, machine as necessary, check again (for each cylinder individually) 
When I get around to re-doing my 318, I'm throwing away the open chamber heads I have and buying closed ones.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Considerations on pistons in a 360 engine.
[Re: Moparbil]
#424073
08/04/09 03:06 AM
08/04/09 03:06 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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[quote
Of course I will like to have the highest compression but absolutely without troubles on pump gas.
I would like to avoid any milling.
As I read it, it seems to me that KB 190 needs milling but KB 107 or TRW speed pro do not.
Please correct me if I am all wrong.
If your talking about milling the pistons, you won't have to, the KB190s require no milling (as long as the block hasn't been decked), they are designed for open chamber heads like the J 915s, you say you would like the highest compression on pump gas, then these are the ones you want IMO, the Quench dome is approx. .040".042" high, you run a .039" gasket, the dome goes right up in the open area of the head, you can run a straight edge right across the gasket & the domes are right there, the outer part of the piston sits around .018" below deck. I've run both (190s & 107s), i will never use the 107s again after useing the 190s, the design of the 190 is to achieve the best quench possible, so you can get above 10.1, & still run on pump premium, the better the quench, the higher compression you can run on the same octane without detination, i ran the 268 cam in 1 360 that had the 107s, the other had the XE284H & 190s, stock J heads, RPM air gap, 750dp, it was night & day, cylinder (cranking pressure) was around 180, timing was at 36* all in at 2200, 456 gears, 2800 stall, never pinged a lick on 89.
I will have to add that this was at 3700ft. Alt, so pump high test was 89, at sea level its 93, in my area (1600 ft.), its dropped to 91.
Last edited by joedust451; 08/04/09 03:09 AM.
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Re: Considerations on pistons in a 360 engine.
[Re: MoparforLife]
#424074
08/04/09 03:18 AM
08/04/09 03:18 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
IMO - unless you are planning on the engine running 100,000+ miles standard cast rings will more than suffice and save a few bucks at the same time. It was not uncommon for the OEM type rings to run 100,000. 
Standard cast rings do seat quick & last awhile, But they generate more drag/wear on the cylinders then a Moly plasma ring, so it robs some HP, i always run moly/plasma rings in my thrasher builds, they will seal up great with the right finish hone, & have less drag then a standard cast.
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Re: Considerations on pistons in a 360 engine.
[Re: Moparbil]
#424077
08/04/09 11:08 AM
08/04/09 11:08 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Ok with the rings
But your recommened cam xe284h seems too extreme to me. I need normal drive ability, not high rpm and rough idle.
Remember the 360 has its stock cast crank.
Other cam suggestions to match the KB190 pistons.
The cam isn't as extreme as you may think, with the extra compression, it was a torque monster, even with the 2800 stall, now this was at 3700ft. in a fully loaded bench seat 73 Swinger, i'm sure i was around 3500 lbs. with me in it, plus the Alt. was killing it but you'de never know it (13.2s on the limiter in every gear), if only i took it down to Dallas & ran it & put a 6700 chip in it (had a 6000), i'm sure there was low 12s in it, not bad for a mild SB.
I'm not sure exactly what your after performance wise, but i loved the way that 360 turned out, i even had the pistons on the tight side for better sealing (1 & 1/2 thousands), top ring was at .024", second ring at .017", never used a drop of oil & absolutly no blow-by period, never ran hot. Cast cranks are stronger then may think, if your not running a Blower or Turbo or a butt load of HP, don't worry about it!
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Re: Considerations on pistons in a 360 engine.
[Re: Moparbil]
#424078
08/04/09 11:20 AM
08/04/09 11:20 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
My 360 block has the stock spec.
So if I use my old 340 heads (casting no 3418915, 2,02 inlet valve) and a .039" gasket, no milling
should be necessary anywhere, right ?
And the quench will be around the ideal ,040 ,
( will of course have to check)
Is the.039 head gasket stardard in kits or do I have to specify.
So the 340 heads + KB 190 + XE284H is the way to go, I understand. Forgetting the alu heads also saves a lot of money.
The .039" is useally the norm in head gaskets, also, if i'm not mistaken (slep'd sence then), the 915s are J 360 heads, so your good to go, i would also CC the heads & make sure they are close to stock.
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Re: Considerations on pistons in a 360 engine.
[Re: joedust451]
#1986755
01/09/16 03:44 AM
01/09/16 03:44 AM
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Joined: Dec 2015
Posts: 11
South Australia
Retroboy
member
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member
Joined: Dec 2015
Posts: 11
South Australia
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[quote
If your talking about milling the pistons, you won't have to, the KB190s require no milling (as long as the block hasn't been decked), they are designed for open chamber heads like the J 915s, you say you would like the highest compression on pump gas, then these are the ones you want IMO, the Quench dome is approx. .040".042" high, you run a .039" gasket, the dome goes right up in the open area of the head, you can run a straight edge right across the gasket & the domes are right there, the outer part of the piston sits around .018" below deck. I've run both (190s & 107s), i will never use the 107s again after useing the 190s, the design of the 190 is to achieve the best quench possible, so you can get above 10.1, & still run on pump premium, the better the quench, the higher compression you can run on the same octane without detination, i ran the 268 cam in 1 360 that had the 107s, the other had the XE284H & 190s, stock J heads, RPM air gap, 750dp, it was night & day, cylinder (cranking pressure) was around 180, timing was at 36* all in at 2200, 456 gears, 2800 stall, never pinged a lick on 89.
Not hijacking but Joe did you have to machine the valve reliefs with that cam and the KB190 pistons? Cheers
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