on3 5.0 fox, motor mounts and clearance - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 15 Old 07-08-2012, 11:17 PM Thread Starter
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on3 5.0 fox, motor mounts and clearance

Im installing a newer revision on3 kit in my '89 coupe. Car has never been wrecked and has the stock k member. Motor mounts are new oem ford replacement convertible mounts. The driver header clears the sway bar bracket by a mile but is kinda close to the steering rack boot on that side, passenger side header is resting on the ac line and pressing it down and is also almost touching the frame. I spaced the engine up .400 and got the passenger header off the ac line and the driver header looks pretty good even between steering boot and sway bar bracket. I thought these kits were suppose to fit best with the convertible mounts no?? How much clearance should i have between the passenger header and frame?


'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4

Last edited by MdntRanger50; 07-08-2012 at 11:20 PM. Reason: added info
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post #2 of 15 Old 07-09-2012, 11:51 PM Thread Starter
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I will ask a different way. What engine mounts are you using with your on3 fox kit and how much clearance do you have between the passenger header and frame rail?


'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #3 of 15 Old 07-10-2012, 12:41 AM
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Prothanes: Prothane Motion Control 6-501 - Prothane Motor Mounts - Overview - SummitRacing.com. Tons of clearance everywhere on my 92, 87 and 90 with On3 kits. I wanted to ad that the 87 now has an AJE K member with the AJE specific mounts and I still have tons of clearance.

92 Hatch On3 Turbo, T56
92 Vert 349 Lunati Stroker T5
87 Gt Eddy HCI T5
87 Notch in progress

Last edited by fmyth; 07-10-2012 at 10:36 AM.
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post #4 of 15 Old 07-10-2012, 06:08 AM Thread Starter
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Thanks for your reply. Any chance you ever compared the height differences between the prothane mounts and oem ford convertible mounts?

'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #5 of 15 Old 07-10-2012, 08:07 AM Thread Starter
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From my researching it seems the prothane mounts do make the engine sit up higher than convertible mounts and the energy suspension poly mounts too

'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #6 of 15 Old 07-10-2012, 10:38 AM
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Quote:
Originally Posted by MdntRanger50 View Post
Thanks for your reply. Any chance you ever compared the height differences between the prothane mounts and oem ford convertible mounts?
The Prothane's raise your engine enough that you need to be aware of your intake to hood clearance. The first time I dropped my hood on the 92 I got a nice little dent from the vac line that comes out of the top of my TB! I removed that 90 deg fitting and plugged the port.

92 Hatch On3 Turbo, T56
92 Vert 349 Lunati Stroker T5
87 Gt Eddy HCI T5
87 Notch in progress
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post #7 of 15 Old 07-10-2012, 12:05 PM
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I'm running Energy Suspension mounts on mine. Plenty of clearance everywhere.

1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #8 of 15 Old 07-10-2012, 11:18 PM Thread Starter
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Quote:
The Prothane's raise your engine enough that you need to be aware of your intake to hood clearance.
Thanks for the heads up, i will definitely check hood clearance.

Quote:
I'm running Energy Suspension mounts on mine. Plenty of clearance everywhere.
The TW heads have standard height exhaust ports correct? I cant remember.

I made some 1/2 spacers on the lathe at work, so now i have the engine raised .500 everything looks ok now, still not as much clearance as i would like between passenger header and body but the driver side is pretty much centered now pointing between steering boot and sway bar bracket. I guess im going to try it like this and see how it works. I dont think i want to space it up any more than 1/2 inch with spacers, if i need to go more i will try the prothane mounts.
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post #9 of 15 Old 07-11-2012, 09:19 AM
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Quote:
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The TW heads have standard height exhaust ports correct? I cant remember.
Correct.

1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #10 of 15 Old 07-11-2012, 11:20 PM Thread Starter
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Well im going to have to lower the engine back down. The down pipe is contacting the floorpan before the v flanges pull together on the turbine and the crossover pipe is too close to the sway bar. I relocated the ac line to get it out of the way and got the engine to shift over slightly which i think will be enough for the passenger header to clear the frame rail when i take the spacers out.


'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #11 of 15 Old 07-14-2012, 05:27 PM Thread Starter
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I took the spacers out and lowered the engine back down to just the oem ford convertible mounts, after relocated the high side ac line and shifting the engine over slight everything clears good now. Passenger side header is still kinda close to frame rail but thats side to side, up and down looks good so if the motor rolls a little under load it will clear. Now the down pipe just contacts the bent area where the firewall and floor pan meet when the v flanged pull together and seal. Im going to see what i can do with lowering the transmission down at the mount a little, doesnt need much. Currently im positioning the intercooler and mocking up the cold side piping and test fitting the bumper cover.

'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4

Last edited by MdntRanger50; 07-14-2012 at 05:28 PM. Reason: spelling correction
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post #12 of 15 Old 07-18-2012, 07:08 PM
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Quote:
Originally Posted by MdntRanger50 View Post
I took the spacers out and lowered the engine back down to just the oem ford convertible mounts, after relocated the high side ac line and shifting the engine over slight everything clears good now. Passenger side header is still kinda close to frame rail but thats side to side, up and down looks good so if the motor rolls a little under load it will clear. Now the down pipe just contacts the bent area where the firewall and floor pan meet when the v flanged pull together and seal. Im going to see what i can do with lowering the transmission down at the mount a little, doesnt need much. Currently im positioning the intercooler and mocking up the cold side piping and test fitting the bumper cover.
I'm currently installing this same kit on a 92 FOX GT and I'm having clearance issues on the passenger side. I was hoping you could post or pm me a pic of how you relocated your AC line. Did you bend it up and run it along the fenderwell? Any help would be greatly appreciated. How close is the downpipe to the evaporator on the firewall? My downpipe as it sits now is just touching it..I have stock non convertible mounts so I'm trying to decide if I can make it work with what I got or just buy the new mounts.

MFT
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post #13 of 15 Old 07-19-2012, 06:13 AM Thread Starter
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I used a hand 1/2" stainless steel tubing bender to reshape the line. I will post a picture this weekend when i get back home. And my downpipe comes close to everything, i think thats just the way it is going to be with running a 3 inch pipe down through there, just not much room to work with. I also have all my hot side wrapped.

'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #14 of 15 Old 07-22-2012, 11:24 AM Thread Starter
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Quote:
I'm currently installing this same kit on a 92 FOX GT and I'm having clearance issues on the passenger side. I was hoping you could post or pm me a pic of how you relocated your AC line.









'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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post #15 of 15 Old 07-22-2012, 11:32 AM Thread Starter
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I removed the exhaust hanger bracket that sandwiches in between the transmission mount and tail housing which is about an 1/8 inch thick. I also installed an energy suspension poly trans mount, this lowered the back end down enough that the downpipe now has about 1/8 inch clearance from the point where is was touching the floor pan/firewall bend. As far as the hot side, everything has good clearance now.

'91 Ranger, 306, 270HR14, Tri-y, RamAir, T5, 3.73, Aeromotive Sys, QH, LM2, Tunerview II, A9L, BE & EA
'89 Mustang coupe, 5.0, AOD, HO cam, 70mm Turbo, 60lb inj, 340lph, 3.27, QH, LC-1, A9P, Tunerview II
'98 Ranger 2WD 5.0, GT40, HO cam, 4R70W, 3.73, QH, SLL4
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