compression ratio ? May 18, 2008, 08:23:27 AM whats the compression ratio of an 88 5.0 non H O?cougar-tbird etc.[sorry-cant spell] Quote Selected
compression ratio ? Reply #1 – May 18, 2008, 08:45:42 AM Don't hold me to this I think its 8.5-1. Quote Selected
compression ratio ? Reply #2 – May 18, 2008, 09:02:39 AM i saw in the 5.0 handbook the pistons were dished butcouldnt find a c r. they were also cast .getting ready for the shorty headers install and was wondering with that low ofc r if i would gain that much oomph or just be able to hear it. got turbos and a gutted last cat. Quote Selected
compression ratio ? Reply #3 – May 18, 2008, 09:10:40 AM Good 1 5/8 headers and dual ex.would be worth it.you will gain some hp. Quote Selected
compression ratio ? Reply #5 – May 18, 2008, 10:22:39 AM Quote from: V8Demon;2195488.9:1 I thought that was a sd with e-7 heads? but I'm not sure either. Quote Selected
compression ratio ? Reply #6 – May 18, 2008, 10:43:39 AM Same for HO and SO.....SO = flat tops w/ bigger comb. chamber.HO = dished w/ smaller comb. chamberSO/Flat tops w/e7's = a slight bit more. Quote Selected
compression ratio ? Reply #7 – May 18, 2008, 12:30:03 PM did the 86 HO motor also use the19lb injectors like thelater mustangs? iwas thinking of just later using the 86mustang cam and 58mm upper stuff.i also have an nos60mm throttle body but i figured id lose some bottomend.i also hve the 87 upper and ecm. ill try the dualsfirst and see what happens. thank for the help.--irv p.s. not looking for a true perfomance car, just a littlemore than it came with. Quote Selected
compression ratio ? Reply #8 – May 18, 2008, 02:32:52 PM 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) Quote Selected
compression ratio ? Reply #9 – May 18, 2008, 03:22:11 PM Quotedid the 86 HO motor also use the19lb injectors like thelater mustangs?Yes.Quoteiwas thinking of just later using the 86mustang cam and 58mm upper stuff.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.Quotei also have an nos60mm throttle body but i figured id lose some bottomend.i also hve the 87 upper and ecm.Use this stuff. You won't lose the bottom end.... Quote Selected
compression ratio ? Reply #10 – May 18, 2008, 03:44:31 PM according to the mustang 50 handbook the 86 mustang and caprigot a 58mm tb. in 87 and up the mustang got a 60mm throttlebody.the 87 and up also got a larger upper plenum, betterunshrouded heads ,and a better cam.if i keep my stock longblockthere is no sense in going to far with the rest of it. i dont knowthe 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 rockersand 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 sensorextesions with a stock mustang hpipe, but dont know yet.edit--SO lift around.400HO 86--.445 also more duration87 up-lift about the same -duration and overlap change Quote Selected
compression ratio ? Reply #11 – May 18, 2008, 08:19:04 PM 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..... Quote Selected
compression ratio ? Reply #12 – May 18, 2008, 09:09:40 PM hey! i saw that page somewhere today.great reference book.i havent messed that much w/engine building since the late60s and early 70s. glad to have some real world experiencefrom you guys on just about everything i need to know.i thank you all very much! --irv toms Quote Selected
compression ratio ? Reply #13 – May 20, 2008, 07:30:39 PM 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... Quote Selected
compression ratio ? Reply #14 – May 21, 2008, 01:28:03 PM You probably will have to extend the o2's,you can splice your own wire to them to make them longer, Quote Selected
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