Compression too high??

93ConvertibleLX · Dec 15, 2003

Would this head be suitable for a turbo application, or is the high compression a bad idea for turbo???

whoops! thought I included a link but it magically disappeared. here is the head I am referring to:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33617&item=2448591484

i4power · Dec 15, 2003

The head would be fine, but the exhaust valves won't work too good. You'll have to get them off a turbo head.

93ConvertibleLX · Dec 15, 2003

i4power said:
The head would be fine, but the exhaust valves won't work too good. You'll have to get them off a turbo head.

Well actually I was inteerested in the head because of the valve sizes. The "H/O SVO" valves that they sell on there are 1.89 intake and 1.59 exhaust... so I figured this head comes with a little bit bigger valves than that, which is good...right? If I were to buy the H/O valve kit I would have to work on my head a bit to use the bigger valves, whereas with the performance head the work is already done....(the guy paid $367.00 for all the head work done including the surfacing). My only concern was the high compression ratio this head would have. I'm pretty sure someone told me that with a turbo engine high compression=bad.

Stinger · Dec 15, 2003

I bet the compression would be too high for pump gas without a turbo even if you used dished turbo pistons...not to mention a turbo blowing on it.

Stinger

Duanetc1 · Dec 15, 2003

12:1 compression + forced induction= quick money spent

93ConvertibleLX · Dec 15, 2003

Stinger said:
I bet the compression would be too high for pump gas without a turbo even if you used dished turbo pistons...not to mention a turbo blowing on it.

Stinger

I think this is head is set up for a circle track 2.3 car running on alchohol, but if I used the turbo pistons with 93+ octane would it still be too high to use with my turbo setup?? Basically, I am trying to figure out a way that I could use this head because I REALLY need a turbo head, and it would be nice to get one that has all the work already done.

Duanetc1 · Dec 15, 2003

93ConvertibleLX said:
I think this is head is set up for a circle track 2.3 car running on alchohol, but if I used the turbo pistons with 93+ octane would it still be too high to use with my turbo setup?? Basically, I am trying to figure out a way that I could use this head because I REALLY need a turbo head, and it would be nice to get one that has all the work already done.

probably-you always wanna run at least 91 with 8:1 in a turbo motor-I have a couple turbo heads laying around what exactly do you want done to one?

nomuffler · Dec 15, 2003

Duanetc1 said:
probably-you always wanna run at least 91 with 8:1 in a turbo motor-I have a couple turbo heads laying around what exactly do you want done to one?

from what I understand a high compression ratio with a turbo abuses the rings real bad and will wear out the ring lands before to long. And yeah 12:1 is alot, you'd probably have to compromise timing to not detonate all the time.

Stinger · Dec 15, 2003

Yes, it would still be too high of compression. Look at how much has been shaved off that head. It almost looks like they even did the angle shave I've heard about the roundy round guys using to get higher compression...

You realize there is a TF member that offers completely rebuilt turbo heads with whatever mods you want (bigger valve for instance) for a very fair price right?

93ConvertibleLX · Dec 15, 2003

Duanetc1 said:
probably-you always wanna run at least 91 with 8:1 in a turbo motor-I have a couple turbo heads laying around what exactly do you want done to one?

Well if I were to go with a stock head I would definately like to install the large valve kit, and also do alot of porting to open everything up,polish the chambers, unshoud the valves a bit and get a nice 3 angle valve job.... Im not sure yet which cam I should go with, but i think i want to do a roller cam with hydraulic lifters and such... I dont know, I guess Im open to suggestions from other guys here that have done head mods.

93ConvertibleLX · Dec 15, 2003

Stinger said:
You realize there is a TF member that offers completely rebuilt turbo heads with whatever mods you want (bigger valve for instance) for a very fair price right?

nooooooooooo........... I dont really know where to go for the parts I want. All I know is I am planning on a tubular header from the vendor on turboford (the "SS" ones), and I am going to get a sheetmetal intake from Bob. I am still looking for a good shortblock in my area, but its not easy where I am at, we only have a couple you-pull lots and they are 20 min away. So if you know of any other people to go to for parts I would appreciate the help, thanks!

mr_woodster · Dec 15, 2003

I'm currently getting my big valve head setup ( at the shop making sure the head is worth the grind+big seat install). Any ol head will work for that, just buy the vavles, get yourself a head and take it to a proshop. If you want it ported, spend 30$ at harbor frieght and do it yourself, or you could get it done "professionaly" , just depends on who/what you know, and how much green you've got to spend. As far as the sheet metal intake, i havent heard good or bad about that( someone fill me in) , i would opt out and save for a better turbo. Like i was saying, it really depends on what you have too spend and time frame you want this motor in your car by. After you locate a short block its money in the bank to have the bottom end re-seal/bearings (basicly rebuilt), after that, plus a turbo header, hoses, upper seal kit, computer, oil, and a 1,000 other small things that are good to do Along the way, Its gonna cost enough cash to get it done right, i'd suggest A: a Budget
b: some realistic goal, like hp or quarter mile time C: and maybe a due date.

Me, i guess im just impatient...i could spend 2 years saving and adding to this swap, i just want the basics done right so i can do more later without worries

my setup so far
86 tc motor complete(done)
rebuilt bottom end (in progess,maybe upgrade crowler rods*)
stock t3(done)
Nitrous works 50-175hp wet kit(35% installed,done till motor swap)
dual core volvo intercooler(have the cores, just need welding)
ported & polished head(mostly done)
Big valves (at shop,in progress)
ported E6( waiting for porting, bauhaha)
Gutted upper ,knifedge lower intake (done)
Ranger roller cam + RR(done)
La3(done!)
Big vam(done!)
Boost gauge (installed and wired! done!)
Walbro 255lph fuel pump (waiting for empty tank to install)

Still needed/wanted
Gillis boost controller
BOV
AFPR
Crowler Rods

the DEAR SANTA LIST:
Turbo header + 3in dp
Hybrid turbo...i could live with an hx 35 and a turboheader

I have somewhere from 800-1,000$ already invested, so you make the call on what u can afford

93ConvertibleLX · Dec 16, 2003

mr_woodster said:
, Its gonna cost enough cash to get it done right, i'd suggest A: a Budget
b: some realistic goal, like hp or quarter mile time C: and maybe a due date.

QUOTE]
Post Disclaimer: this post is LONG!
Well here is my scenario; I dont have a time frame or budget established and I dont want either of those. I know that a car is the worst investment in the world, and any money i dump in I'm not gonna get back out. Also, its not my daily driver so this project could take a year or 10 years for all I care. My only goal is to get it done right the first time, and to not have to make any major changes down the road. i want to build something that I will hold on to for a long time and keep in my garage to show my kids when Im old. lol. maybe not, but you get the picture. this isnt gonna be a dialy driver or a race-setup. this 'stang is gonna be something I can drive on the weekends and show the ricers in town what "First On Race Day" really means. I already am half way through a complete interior resto including the following:

-Brand new black molded carpet
-Custom cut polished aluminum panels in the stock radio,heater control, and vent locations (looks sweet with gauges installed)
-Polished Aluminum guage panel
(replaces stock speedo, tach and other guages with autometer ones)
-Autometer lunar gauges
(boost,air/fuel,fuel press.,oil press....Speedo and tach on the way)
-Brand new black leather "sport" seats from Summit racing catalog (MERRY CHRISTMAS TO ME!)
-Guage pod for 5" tach and 2 other guages that sits on dash
(looks stock!)

Still to come:
-Full 8-point roll bar
(its a convertible and yes, this may be overkill on a 4-cyl 'stang but i only paid $80 for it!)
-Black console with arm-rest delete
-5 point harnesses for the sport seats
-Removed rear seat and fabricated an aluminum "rear seat delete" panel, but have yet to install it.

Theres a lot of dough I have dropped into the interior right there, and I havent even started on the body or engine!
basically I estimate Iam going to spend $10,000 on this project (call me crazy but its cheaper than a new v6 stang with less performance....the v6 guys are gonna kill me), but when Its all said and done, its gunna be sweet. Its not gonna be some junkyard stang with a sweet engine. Hopefully it will have 'sho AND go'! Some body mods I have planned are:
Wings West dominator body kit....$$$
Cobra R wing
(yes I know, it does look a bit "rice" on a fox body, but oh well!)
Chrome Bullit wheels
Already have a Cobra "RR" SVO hood (with functional hood scoop)
Custom fiberglass "speedster" tonneau cover (some guy in canada modifies the sn-95 ones to fit fox convertibles)

Also, since this will only be a "nice weather driver", I plan to remove the convertible top and all of the pumps and hardware and just leave the tonneau cover on permanently. My dad and I were trying to figure out a way to sawzall the top of a junkyard notchback or coupe from the windshield to the decklid,in order to make a custom removeable hardtop, but there was just too much fabrication work involved and we scrapped the idea.
Well I think this post has gotten long enough, so Ill let someone reply to something. lol

93ConvertibleLX · Dec 16, 2003

is there anyway to move this thread to "Talk".....?
its starting to stray a bit from "technical discussion"

mr_woodster · Dec 16, 2003

Sounds like a killer resto/build up. I plan on doing some Sho, if you will for my stang, but i rather like the GO first. This is my driver car...and i love eating rice. First On Race Day has always been my modo Ford may have not shipped my lx that way, but im sure as heck gonna make it into one quick stang! Well good luck on the project, when you get to the motor....i fear what may come with just looking at what you've got planned for the rest of the car

Compression too high??

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