Quik

just use your injectors. they are both 19s.

take the TB also since its 65

now with just the increase in CR from the heads youll gain 15hp. now with the setup youll see like 40 or so just in the parts + the CR so figure 60hp from that setup. im guessing here and i always guess low. its better to think low and get high results then think high and get low results

87GT5.0

Ive read all your posts on this and the only thing thats confusing me is what is CR, im new to 5.0's sorry for my stupidity lol

Quik

Compression Ratio

since the GTP heads have smaller CCs it will raise the CR up on a stock 5.0 HO motor. it will raise it .5 and every .5 CR is 15 HP on a typical 5.0 HO motor

birdman076

To reiterate, you may need different headers with the P heads. The compression ratio will increase, but as far as 15hp increase from that alone I think thats highly optimistic. There is no set in stone value or chart for how much hp a bump in compression gives, the general consensus seems to be between 2 and 5 percent per compression point.

Quote #1 sourced from www.442.com

"The change in horsepower due to the change in compression ratio is relative but not directly proportional. That is to say that a change from 8:1 to 9:1 will give you a larger increase than would the change from 13:1 to 14:1. I seem to recall for every one point change around 7:1, that is the change from 7:1 to 8:1, would be slightly more than a 3% power increase. Once you get up to around 13:1, that same one point change is only good for about a 1.5% power increase.

The rule of thumb for the compression ratios run in most street engines is: for every point change in the compression ratio your power output will change by 2%. Using this rule of thumb on an engine that produces 400 hp, every 1 point change in compression ratio will result in approx. a 8hp change in output."


Quote #2 sourced from beyond.ca car forums

"Remember this 1 point in static compression ratio is worth ~5% gains and this is regardless of boost or not. but the extra psi you may be able to run with lower compression SHOULD make more power than compression. Its all a trade off, depends on specifics of the cam profiles, head design, turbo choice, intercooler choice, etc. The safe bet is drop compression tho"

I have seen a few reference charts with the same numbers or close to them as well. So given the 2-5% range and take the average of 3.5% with a stock 225hp stang 1 full point in compression bump would give you 7.875hp. But there are other benefits to going to the P heads, things like swirl and flow which are better than the regular GT40 heads.


As far as the 65mm throttle body found on the Explorer, it is not a direct swap you need to make modifications for it to work properly. Second topic under "Mustang Cylinder Head, Basic Mods, Engine Mechanical Information." on the below link has a PDF file that tells what needs to be done to use it.


http://www.veryuseful.com/mustang/tech/engine/

91LXstanger

^^^ damn, another good post, bro. Keep em comin!.

white93 GT

im really intresed about this.......what years of explorers can you get the intake, heads and injectors off of?

87GT5.0

Look back over the thread and it tells you i asked the same question

91LXstanger

if u guys really want to do it....Just by the engine (brand new), throw a badass cam in there, probably get the ECU or re-calibrate the exsisting one, have a nice exhaust setup, 1.7 rockers, and whatever else u want. The only thing,apparently, that lacks in this explorer engine is the lasy cam. i bet it runs strong in a stang with a nice cam. Oh yeah, How many cubic inches is that explorer engine???.