whats the compression ratio of an 88 5.0 non H O?
cougar-tbird etc.
[sorry-cant spell]
Don't hold me to this I think its 8.5-1.
i saw in the 5.0 handbook the pistons were dished but
couldnt find a c r. they were also cast .getting ready for the
shorty headers install and was wondering with that low of
c r if i would gain that much oomph or just be able to
hear it. got turbos and a gutted last cat.
Good 1 5/8 headers and dual ex.would be worth it.you will gain some hp.
8.9:1
I thought that was a sd with e-7 heads? but I'm not sure either.
Same for HO and SO.....SO = flat tops w/ bigger comb. chamber.
HO = dished w/ smaller comb. chamber
SO/Flat tops w/e7's = a slight bit more.
did the 86 HO motor also use the19lb injectors like the
later mustangs? iwas thinking of just later using the 86
mustang cam and 58mm upper stuff.i also have an nos
60mm throttle body but i figured id lose some bottom
end.i also hve the 87 upper and ecm. ill try the duals
first and see what happens. thank for the help.
--irv
p.s. not looking for a true perfomance car, just a little
more than it came with.
When I changed from the iron manifolds to a set of full length headers and dual exhaust(Walker turbos), it made a HUGE difference in power. (87 Sport)
Yes.
Th cam for an 86 is the early grind HO cam. Nothing wrong with it --very minor differences from the later ones. Go for it! THe intake......The last upper intake I looked at from an 86 Stang motor was IDENTICAL to the SO upper. What do you mean by 58 mm upper stuff? The rails and such? That's all the same. You'll only need to swap the injectors.
Use this stuff. You won't lose the bottom end....
according to the mustang 50 handbook the 86 mustang and capri
got a 58mm tb. in 87 and up the mustang got a 60mm throttle
body.the 87 and up also got a larger upper plenum, better
unshrouded heads ,and a better cam.if i keep my stock longblock
there is no sense in going to far with the rest of it. i dont know
the spec on the stock cam[SO] but with that low of compression,
i dont want to lose cylinder pressure. i could go 1.7 cobra rockers
and keep the stock cam. or i could just leave it alone and be happy.
duals should be on soon. i was hoping i wouldnt need o2 sensor
extesions with a stock mustang hpipe, but dont know yet.
edit--SO lift around.400
HO 86--.445 also more duration
87 up-lift about the same -duration and overlap change
You'll be fine with the HO cam....The SO cam is basically a holdover from carbed motors of the EARLY 80's. In thie version it's a hydraulic roller as opposeed to the earlier flat tappet design.
The long runner design of the 5.0 manifold keeps your torque up even after you swap to an HO cam. As you'll see overall duration is increased, but not to a point where you're low end torque would disappear. In fact look at the overlap. Almost the same....
The full specs.....
hey! i saw that page somewhere today.great reference book.
i havent messed that much w/engine building since the late
60s and early 70s. glad to have some real world experience
from you guys on just about everything i need to know.
i thank you all very much! --irv toms
The TV cable hookup is different for the '86 58mm T-Body... Those use the "rivet head" and cable has a "hook" that fits over it... Starting '87 the infamous POS plastic grommet became the method of retaining the cable...
irv, use the 60mm TB and a HO upper, it can't hurt...
You probably will have to extend the o2's,you can splice your own wire to them to make them longer,
hopefully the headers and dualsgo on tomorrow.
factory shorties, walker hpipe,super turbos, but
88 cougar tailpipes [already on]. will see what
happens.
DO NOT extend the wires on the O2 sensor wire as they are a special wire and extending them can cause problems. Extend the wires that are part of the engine harness as then it doesnt matter.
o2's work off resistance. splicing a wire adds resistance through buttconectors, solder and stuff like that. just get an extension kit, its made to have as little effect on ohms as it can. besides, if you do cut those wires and it turns out your splicing did make a difference, those o2's are gone forever. thats more money then a simple kit.
Bosch makes O2 sensors with longer wires for our applications. Those are what I use.
just got the bosch sensors fri and the bbk extensions.
youre right . i sent the extensions back. friend started
on the headers yesterday. glad i didnt try it at the shop.
he has a large 2 post lift. the words were flying about
hooking up the h pipe. i had a t5 hangar. ended up
using the stock one instead. had to leave for grandsons
ballgame so i havent seen how far it got fri.
Not so... Unlike the other engine sensors, o2 sensor produce a small voltage(approx .5 to 1v)... IF the resistance of the circuit were high enough operation could be impaired, but a std but connector will not cause a problem...
This said I don't recommend those for any circuit, as over time they will likely cause a problem... I cut, solder, and heat shrink all my connections(including my reworked o2 harness)...
i coulda swore thats what they taught me at tech school. like two electrodes and the abilty of the electricity to make the jump depended on the atmospheric conditions inside the pipe. i guess i need to go back to school. how would it produce its own electricy?