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  #1  
Old 05-10-2011, 06:08 PM
uncle_jessie uncle_jessie is offline
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Got to ride in a *hot* six today!

So the machine shop I'm working with gave me the number of a guy who built a 300. He recommended I do this so I could see what kind of results i could expect and make sure I didn't have my expectations to high. So I called the fella, he was super nice and told me to come over and check out his truck. His is .040 over, flat tops, 9+ to 1 comp, balanced rotating assy, zero decked, ported head decked .060, stock size valves, comp 268H, clifford intake (that took 2 months to get), mallory unilite distributor with Hy fire ignition, Taylor wires, holley 390cfm, performance built C-4 automatic. All I can say is this, my expectations were actually LOW, That truck was nothing short of impressive, after the rear tires hooked up it implanted my but in the seat and pulled like hell up to 5k.

AWESOME!! I'm definately pumped now!
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Old 05-10-2011, 06:31 PM
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Wooh Hooh Bud ya go for it.
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Old 05-10-2011, 08:10 PM
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I wonder what the 300 sounds like at 5k? Would have been nice to have gotten a vid, I bet that was a fun truck.
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  #4  
Old 05-10-2011, 09:54 PM
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Sounds like fun. But ... "flat top pistons, .060" off the head, zero deck," with 9.0:1 c.r. simply ain't happening in this universe. I have dish 8.7:1 pistons, with .020" off the block and head, and I don't get 9.0:1! I'd say he was closer to 9.6--9.7:1, maybe higher.

That means he is probably running premium gas, and getting 10-12 on the freeway, depending on gears. It is great fun to play, but if it is a d.d., each parts selection can daily cost ya.


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Old 05-11-2011, 01:43 PM
uncle_jessie uncle_jessie is offline
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Quote:
Originally Posted by F-250 restorer View Post
Sounds like fun. But ... "flat top pistons, .060" off the head, zero deck," with 9.0:1 c.r. simply ain't happening in this universe. I have dish 8.7:1 pistons, with .020" off the block and head, and I don't get 9.0:1! I'd say he was closer to 9.6--9.7:1, maybe higher.

That means he is probably running premium gas, and getting 10-12 on the freeway, depending on gears. It is great fun to play, but if it is a d.d., each parts selection can daily cost ya.

Oh yeah I'm sure he is running 93 I didn't ask. I was thinking the same thats why I put 9+:1 compression. I'm going with the dished pistons and maybe .020 milled off the head just to true it up.
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  #6  
Old 05-11-2011, 02:00 PM
uncle_jessie uncle_jessie is offline
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I just called him, Yep his calculated comp ratio is 9.8:1 and 93 octane gas it is. So ummm yeah that won't be happening with mine LOL.
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Old 08-03-2011, 09:10 PM
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I"m running 9's on compression without doing more than just truing up the deck and the head. Running Keith black's "ups" pistons help, or you could go with pistons made for the 400.
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  #8  
Old 08-06-2011, 11:31 PM
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F250Restorer, very probably I misunderstand, but you really AREN'T saying that the guy's fuel economy is probably mediocre BECAUSE he has high compression . . . are you??

Other things aside, more compression is good for fuel economy . . . though having to use high octane gas cuts into the monetary savings . . . which is why high compression plus cheap gas plus water injection is the way to save money on gasoline.
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  #9  
Old 08-07-2011, 12:35 AM
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Originally Posted by seattle smitty View Post
F250Restorer, very probably I misunderstand, but you really AREN'T saying that the guy's fuel economy is probably mediocre BECAUSE he has high compression . . . are you??

Other things aside, more compression is good for fuel economy . . . though having to use high octane gas cuts into the monetary savings . . . which is why high compression plus cheap gas plus water injection is the way to save money on gasoline.
After rereading my post, it probably sounded like that, but I meant that with all his mods combined ....
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Old 08-08-2011, 02:22 AM
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Water injection? I know that it cools off the combustion chambers, but I thought that was only used with forced induction systems.. I'm not really sure how it works, or how one would go about setting it up.. So please, tell me more..
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  #11  
Old 08-08-2011, 11:37 PM
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It's a subject to google and study, but put simply, adding compression makes your engine more efficient (with diminishing returns, the higher you go), but quickly requires higher octane fuel to avoid detonation under load.

About ninety years ago, the great English automotive engineer, Sir Harry Ricardo, discovered that water, sprayed into the intake tract, was a very potent anti-detonant. The highly developed aircraft piston engines of WW2 frequently had and ADI (anti-detonation injection) system using half water and half methanol. As you said, these were supercharged engines. However, the cooling effect of the water is the same for unblown engines (and if you use half methanol, which lowers the freezing point, it makes up for some of the power lost to the cooling; methanol's octane rating is something like 135, I forget).

So you can have raised compression for fuel efficiency and power (win-win!!), but stay with the standard 87 octane gas, and quell detonation under load with water injection. Consider that much of the time you don't even need 87 octane; cruising down a level freeway with light throttle only requires around 55 octane to prevent detonation. But accellerating up an on-ramp, or up a hill, or hauling a big load puts the octane requirement way up. So you can either buy the octane that will cover you under all such conditions (understanding that it's more than you need, a lot of the time), or you can buy a octane that's good for all but heavy work, and introduce water injection under those conditions. It's more mechanical complexity, and probably not for the inexperienced tuner, but done properly it might save money in the long run by letting you use cheap gas.

However, don't be over-sold on water injection, which is of no performance value whatever when added to an engine which doesn't need it. If your engine doesn't make the sound of a cookie tin with a bunch of BBs being shaken when you climb a hill with a load of passengers, you don't need water injection.

Again, google it. Spearco is one source.

(I have no idea why the typeface went to bold
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  #12  
Old 08-09-2011, 08:24 AM
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so did you ask if he's a member?
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Old 08-09-2011, 12:51 PM
seattle smitty seattle smitty is offline
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Did I ask? No. Was I supposed to? Why? Is this something new, or new here? I'm an old guy, and don't know all the protocols of this medium. I'm still not sure I should have got into it at all.
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Old 08-09-2011, 01:33 PM
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Quote:
Originally Posted by seattle smitty View Post
F250Restorer, very probably I misunderstand, but you really AREN'T saying that the guy's fuel economy is probably mediocre BECAUSE he has high compression . . . are you??

Other things aside, more compression is good for fuel economy . . . though having to use high octane gas cuts into the monetary savings . . . which is why high compression plus cheap gas plus water injection is the way to save money on gasoline.
This is where if it's available in your area, E85 is great! My planned build for my engine is some high compression ( somewhere around 11.5 - 12.5:1 ) . E85 has a 105 octane rating, plus it cost quite a bit less then 87 octane. You also get the benefit of cooling effect that alcohol has. It's going to make one fun daily driver for me!
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Old 08-09-2011, 02:56 PM
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Quote:
Originally Posted by seattle smitty View Post
Did I ask? No. Was I supposed to? Why? Is this something new, or new here? I'm an old guy, and don't know all the protocols of this medium. I'm still not sure I should have got into it at all.
sorry, i was trying to ask uncle_jessie if he was a member of fte! i tell every ford guy I meet
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Old 08-09-2011, 02:56 PM
 
 
 
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