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Higher compression / 102 Octane Fuel

 
  #1  
Old 05-26-2012, 01:24 PM
GermanMike
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Higher compression / 102 Octane Fuel

I want to run my 2000 V10 only with 102 Octane Fuel, ' cause we only have the choice between 95octane and 102.
If Im right, the engine was intend to run with 87, so the compression ratio of the pistons are 9.2 :1 which is ok, but I think that isnt the last word.
I found now these pistons, which seems to be the only one on the market.
Manley Forged pistons for Ford modular 4.6L, 5.4L & 6.8L
Thats the point where I need the help of you V10 specialist here.
Would make a compression ratio change to 11.2:1 sense?
What should I change too? Rods? Valves? Rollers? Springs?
Dont get me wrong, I dont want to make this truck a purified track racer, it should stay dependable, longlasting and my daily driver, but it should use the fuel with the most efficieny I can get and should be the first one in a stop light race......if I want to.
 
  #2  
Old 05-26-2012, 05:53 PM
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first, the rods are the weak point. second. how much horsepower you looking to get????
 
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Old 05-26-2012, 05:55 PM
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I would think he could just use the 5 star tuner thing and be cheaper overall....I thought that this engine is meant to handle that tuner thingymabob. I have heard of over 400 horse.
 
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Old 05-26-2012, 10:07 PM
GermanMike
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Originally Posted by topscrt View Post
first, the rods are the weak point. second. how much horsepower you looking to get????
I dont look after a magic number of hp and there exist nothing like a break point
to achieve, I just want to use this engine with the fuel I feed her very effective.
All I want is a very reliable, daily driver with grin factor at the stop light.
Shes getting regeared in to 4.3 in July, a new billet torque converter (2600 stall) with a modified valve body in August and than I can talk to Mike AGAIN for getting my Tuner in Sep/Oct........since I have to work blue collared, I have to do it step by step.
....But what are with those pistons?
That I would change the rods, too, if I change the pistons to a 11.2 CR is clear, of course, but what should do?
Is it useful to upgrade the CR?
Are those manley pistons good?
Where is the difference between a 0.20 and 0.30 bored over?
What would happen to my truck at a 11.2 CR?
How much hp and more important torque can I expect after this?
 
  #5  
Old 05-29-2012, 09:52 AM
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You are in Germany, correct? First, I'd make sure the octane ratings in your area are the same as what the US has. We use the R+M/2 method. (RON plus MON, divided by 2)

Octane rating - Wikipedia, the free encyclopedia

Sounds like Germany might be using RON on the pump. Check out what it says and report back.
 
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Old 05-29-2012, 11:29 AM
GermanMike
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That was very helpful. Thank you.
We have here a sort called Ultimate and it says at the pump and the advertisings
that its got 102 octane....
But true is that its got a ROZ of 102 and a MOZ of 88.
This would mean, that its a real 95 Octane Gas.
....but I have no idea how this effects my starting question.
Please, keep on helping me.
I want to know what Im talking about, so I have to learn everything.
 
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Old 05-29-2012, 11:46 AM
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So it's 95 octane. The highest I can buy at regular pumps is 93 here in New York. That has the mandatory 10% ethanol.

You could do with a bump in compression, that's for sure. Stock is 9.2:1 I believe?

If you put PI heads (2000+) on a non-PI engine, you get 10.25:1 or so.

So, put non-PI pistons in your V10 with PI heads, you would get a nice bump in compression.

And they might not be hard to find, even in Germany
 
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Old 05-29-2012, 05:12 PM
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A flat top piston in a 6.8 would only get you so high in compression. Chances are you would require a custom piston to get above 10.5 or so. If it was a 4V I could give you an exact list of what it would take. I dont know the stock CC of either pistons to help you out.

On 93 octane you can go to about 10.5:1-11:1 compression safely without an issue. If you are going to 102 octane then I would bump compression to around 12-12.5:1.
 
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Old 05-30-2012, 03:52 AM
GermanMike
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Originally Posted by Krewat View Post
So it's 95 octane.
If you put PI heads (2000+) on a non-PI engine, you get 10.25:1 or so.
So, put non-PI pistons in your V10 with PI heads, you would get a nice bump in compression.
And they might not be hard to find, even in Germany
Lets make resume.
Its 95 octane and a increase of the CR from the OEM 9.2:1 up to a ~10:1 and 11.5:1 would give me more, ah, lets say kick.
Your idea with the non PI Pistons sounds good and very affordable, but I think, that it would be better to upgrade the rods and the pistons with those from
manley, since I dont want it keep cheap at the costs of reliability. Id rather
want to spend $2000 for those Manley Rods/Pistons than $5000-6000 for totaled
motor and several weeks of getting the groceries on my feet.

Now a few questions.
How much power or increase can I expect of this tune up?
What s the meaning of bored over 0.2 or 0.3.?
Effect this the diameter of pistons? Have I to increase the diameter of my block?
Thanks again for your help?
 
  #10  
Old 05-30-2012, 07:03 AM
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What s the meaning of bored over 0.2 or 0.3.?
Effect this the diameter of pistons? Have I to increase the diameter of my block?

bored 20 thousands over means that the piston is 20 thousands larger than stock or standard,so the block needs to be bored out so that the larger diameter pistons fit,same applies for .30 over,there is very liitle if any power gained by using oversized pistons( if using the same style piston,now if you would go from a dish standard piston to a .20 over flat top that would increase compression and compression makes power)oversized pistons are mostly used if the cylinder walls have damage(grooves,ridges etc.) then you would bore the block to remove the damage and use oversized pistons.
 
  #11  
Old 05-30-2012, 07:09 AM
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can mill ur heads to get lil more compression
 
 
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