n/a 2.3 dual plug head

Nick A · Post by **Nick A** » Sun Nov 21, 2004 1:16 am

Anyone got the info for this swap? i have heard it done before, and realize that i'm going to have a higher compression ratio, however i'd like to hear about some true stories.

Post by **DPDISXR4Ti** » Sun Nov 21, 2004 12:23 pm

Nick- I've been running a turbo-charged motor with DPH for over three years now. I created a Yahoo list shortly after completing the project, which I'd suggest you join. Read through the archives and you'll find most everything you need to know and more. Link below:

http://groups.yahoo.com/group/ford23t-dp/

MerkXRTurbo · Post by **MerkXRTurbo** » Mon Nov 22, 2004 9:58 am

Is there a noticeble difference? I never thought that it was that critical.

Post by **DPDISXR4Ti** » Mon Nov 22, 2004 12:06 pm

MerkXRTurbo wrote:Is there a noticeble difference? I never thought that it was that critical.

With both DPH motors I've built, I made several other changes at the same time, so it's hard to say what's responsible for increases in HP, torque, fuel mileage, and drive-ability, all of which have improved.

Nick A · Post by **Nick A** » Mon Nov 22, 2004 12:31 pm

i want it for higher compression, (meaning i can just keep the boost @ 15psi) .. and have sure-fire spark, leaving nothing un-burned in my exhaust.

souns clever eh?

Post by **DPDISXR4Ti** » Mon Nov 22, 2004 1:04 pm

Go have at it.

If you're using stock turbo pistons, the SCR will go up to about 8.3:1, which is no issue at all. In fact, with my second motor I went with forged flat-tops, so I'm running somewhere around 9.3:1.

Just be aware that you will need less ignition advance with the DP head due to the more efficient dual flame-front. If you try to run a stock 2.3T timing calibration, you'll be asking for trouble. It will ping, especially at part throttle tip-in.

Nick A · Post by **Nick A** » Mon Nov 22, 2004 1:11 pm

i would imagine that there would be a slight increase in HP at lower rpm vs the stock head. just my guess on how compression figures usually affect things like this.

Did these heads come from ford in Roller cam version only? ... going this route my knock 2 birds out with one stone

Post by **DPDISXR4Ti** » Mon Nov 22, 2004 1:42 pm

Nick A wrote:i would imagine that there would be a slight increase in HP at lower rpm vs the stock head. just my guess on how compression figures usually affect things like this.

Did these heads come from ford in Roller cam version only? ... going this route my knock 2 birds out with one stone

The compression increase is relatively insignificant; I bet you get more of a pop from the more efficient combustion, but I won't try to convince you it's a monumental increase.

Yes, all DPH's have the roller cam.

Post by **John Brennan** » Mon Nov 22, 2004 5:11 pm

Do you need to replace the valves for inconel or sodium-filled ones? And what head gasket do you use?

Post by **DPDISXR4Ti** » Mon Nov 22, 2004 5:54 pm

John Brennan wrote:Do you need to replace the valves for inconel or sodium-filled ones? And what head gasket do you use?

You should, but I know of people who have successfully used the stock NA valves without issue. I just used a set of stock exhaust valves out of a turbo head. No need to touch the intake valves.

Head gasket is the same. I'm using that relatively new white-marble colored one - I forget the name - Cometic maybe?