OH , I gotta do it!!!
Elder User
Joined: Mar 2006
Posts: 605
Likes: 0
From: Slippery Rock, PA
Originally Posted by shmoozo
Just a bit of advice I once got from an old engine builder --
When building a performance engine it's usually a bad idea to bore a modern engine's cylinders out any more than required to clean them up and then get them to the next standard piston size. The amount of displacement you can gain by going further is minimal (perhaps 1 or 2%) so it doesn't really add much to either the torque or the HP and you'll risk weakening the cylinder walls in the process. If you're going to be boosting the compression, adding boost, or squirting in big shots of nitrous oxide and pushing the engine hard, that can lead to some pretty spectacular (and therefore costly) engine failures. Furthermore there is no practical, cost efficient way to "unbore" a cylinder block.
Here's the actual displacements you'll see in a Ford 300 six from various overbores in increments of 0.010 inch. I've rounded the displacements to the nearest 0.1 inch.
0.010 -- 301.5 cubic inches
0.020 -- 303.1 cubic inches
0.030 -- 304.6 cubic inches
0.040 -- 306.1 cubic inches
0.050 -- 307.6 cubic inches
0.060 -- 309.2 cubic inches
So what you gain by going to 0.060 over as opposed to, say, 0.030 over is only about 1.5% of the engine's total displacement. That's not even close to being worth the risk.
Trust me. Go conservative on this.
When building a performance engine it's usually a bad idea to bore a modern engine's cylinders out any more than required to clean them up and then get them to the next standard piston size. The amount of displacement you can gain by going further is minimal (perhaps 1 or 2%) so it doesn't really add much to either the torque or the HP and you'll risk weakening the cylinder walls in the process. If you're going to be boosting the compression, adding boost, or squirting in big shots of nitrous oxide and pushing the engine hard, that can lead to some pretty spectacular (and therefore costly) engine failures. Furthermore there is no practical, cost efficient way to "unbore" a cylinder block.
Here's the actual displacements you'll see in a Ford 300 six from various overbores in increments of 0.010 inch. I've rounded the displacements to the nearest 0.1 inch.
0.010 -- 301.5 cubic inches
0.020 -- 303.1 cubic inches
0.030 -- 304.6 cubic inches
0.040 -- 306.1 cubic inches
0.050 -- 307.6 cubic inches
0.060 -- 309.2 cubic inches
So what you gain by going to 0.060 over as opposed to, say, 0.030 over is only about 1.5% of the engine's total displacement. That's not even close to being worth the risk.
Trust me. Go conservative on this.
Post Fiend
Joined: May 2004
Posts: 5,277
Likes: 0
From: St George, SC I-95
if it were me I would bore it all the way out and just have 1 oval shapped piston custom made. Rough guessing says that it would be approx 26" long and 4" wide. Im thinking it will be the worlds first 400ci 1cyl truck engine. That seems to be the best idea Ive heard so far. This is probably more realistically achievable than a 600hp 500tq natually aspirated street motor funded by a high school job.
This is getting out of hand
This is getting out of hand
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
if it were me I would bore it all the way out and just have 1 oval shapped piston custom made. Rough guessing says that it would be approx 26" long and 4" wide. Im thinking it will be the worlds first 400ci 1cyl truck engine.
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Senior User
Joined: Jul 2003
Posts: 311
Likes: 2
From: Nashville
About the water pump: no there's no "high flow" pump for the 300... BUT... if you get a new [not rebuilt] pump made by either Cardone or ASC [or is it ACS?] they'll have a modernized impeller disign with a backer plate that will make them flow ~20% better than the old factory pump. New pumps for the 300 are very inexpensive, just paid about $35 for mine.
As far as coolant additives, "Water Wetter", "40 below" and similar chemicals do indeed work. My old Mercedes runs HOT by nature, and dumping in the correct ammount of -40 dropped the idling temp by a good 20 degrees. Have some friends in the rice racer world who do insane turbo jobs on their tiny engines, and they'll often use it because where the heck are you going to put a larger radiator in a civic??
As far as coolant additives, "Water Wetter", "40 below" and similar chemicals do indeed work. My old Mercedes runs HOT by nature, and dumping in the correct ammount of -40 dropped the idling temp by a good 20 degrees. Have some friends in the rice racer world who do insane turbo jobs on their tiny engines, and they'll often use it because where the heck are you going to put a larger radiator in a civic??
Elder User
Joined: Mar 2006
Posts: 605
Likes: 0
From: Slippery Rock, PA
Originally Posted by 83Van
Have some friends in the rice racer world who do insane turbo jobs on their tiny engines, and they'll often use it because where the heck are you going to put a larger radiator in a civic??
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Originally Posted by havi
You DO realize how much fuel costs these days? I can only imagine the mpg something like that would involve. BTW, If torque is the name of the game, install a Caterpillar engine from a forklift or something.
I'd guestimate 3 gallons to the Mile.
Freshman User
Joined: Dec 2003
Posts: 44
Likes: 0
Originally Posted by broke77f100
isnt boring .080 giving 314? and .060 310 cubes and not 309.2??????????
Stock Bore & Stroke: 4.00" x 3.98"
Overbore, ........ Displacement,
inches ............. cubic inches
---------------------------------
0.000 ---------- 300.085 <-- Stock
0.010 ---------- 301.587
0.020 ---------- 303.093
0.030 ---------- 304.603
0.040 ---------- 306.117
0.050 ---------- 307.634
0.060 ---------- 309.155
0.070 ---------- 310.680
0.080 ---------- 312.208
Last edited by shmoozo; Jun 3, 2006 at 04:45 PM.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
lol, Sarcasm doesn't show well in typed form. But on a side note, I have an article on a 64 ford pickup w/ caterpillar motor....Four-Wheeler I think it was, back in the mid-90's. 3 gallons to the mile...still better than what Bigfoot gets.
PS: not trying to steal this thread.
PS: not trying to steal this thread.