What octane would I need with 10.1:1 compression ratio in a 460?
I know this is a tough question, but any ideas would help.

I'm trying to build something similair to the edlebrock engine:
http://www.edelbrock.com/automotive/7166pp.html

The main difference being that I'm keeping the stock iron heads D3VE) and using cheaper pistons.

Using Keith-Black-137 flat top pistons I can get a piston to head clearance of .04" (ideal for preventing knock), but if the D3VE heads have a 92 cc combustion chamber, then my CR is 10.1:1

I would like to avoid having to buy premium gas.
Thanks,
Brian

 

When that engine came out Service Stations pumped 98 Octane some even higher.

When I feel like spoiling my truck,I mix some AV-Gas (112 Oc)with premium pump gas (91-92 Oc)

Dennis

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You'll need to run premium. Some people feel .004 is a lot of deck clearance on a performance engine. The closer you get to a zero deck, the better quench provided and the less the engine is prone to detonation. .002 or .003 would be good and still leave a little for any future clean-up. May not sound like much, but it does make a difference.

Have you cc'd your heads? The D3s are often 96-97cc chambers. Most shops will cc a chamber for $25 and that could make a difference in your c/r calculation.

 

93 octane wouls be better. If you want to run the timing slower and lose some power, then you may get by with the cheaper stuff. Between 9 to 9.5 max is about the most that you can run on 87 octane. If you run it a little rich, it may help keep the detonation down too.

 

Read this before you build
http://www.speedomotive.com/Building%20Tips.htm

Get that quench right.

 

Thanks for the info. Very helpful.

On a related note, does anybody know (or know where to find) the dimensions of the TRW-L2404 pistons?

Specifically the Piston Compression Height and Dish volume.

Thanks,
Brian

 

Call Summit or Jegs. They have all the specs on pistons they sell.

 

 

>What octane would I need with 10.1:1 compression ratio in a
>460?
>I know this is a tough question, but any ideas would help.
>
>I'm trying to build something similair to the edlebrock
>engine:
>http://www.edelbrock.com/automotive/7166pp.html
>
>The main difference being that I'm keeping the stock iron
>heads D3VE) and using cheaper pistons.
>
>Using Keith-Black-137 flat top pistons I can get a piston to
>head clearance of .04" (ideal for preventing knock), but if
>the D3VE heads have a 92 cc combustion chamber, then my CR
>is 10.1:1
>
>I would like to avoid having to buy premium gas.
>Thanks,
>Brian


I have the D3VE heads and have the KB137 pistons and I definetly have to run premium gas.