Phenolic thermal spacer for PD

[thelostotter]

I’ve already done that anyways so it sounds like nothing needs to change when adding these spacers.

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[SH!FT]

I did a writeup on FI's phenolic spacer kit:
https://www.mustang6g.com/forums/th...acer-kit-on-my-roush-2650-gen3-coyote.213582/

Spacer and blanket details on post #5&6
Cooling results (w/ interchiller) on post #18

I highly recommend installing a thermal blanket on the IM while installing the spacers. The spacers reduce conduction heat transfer. The blanket reduces radiation.

 

[DougS550]

I did a writeup on FI's phenolic spacer kit:
https://www.mustang6g.com/forums/th...acer-kit-on-my-roush-2650-gen3-coyote.213582/

Spacer and blanket details on post #5&6
Cooling results (w/ interchiller) on post #18

I highly recommend installing a thermal blanket on the IM while installing the spacers. The spacers reduce conduction heat transfer. The blanket reduces radiation.

You will have to buy longer bolts using the spaxers.

 

[BlownGP]

What price range makes this affordable?

harrop has them for $200
https://www.harrop-usa.com/ford-thermal-spacers/p139

 

[illtal]

I have harrop spacers, they are made of a fireproof material and they do last a long time. And they work. I was going to have some made to sell, out of the best most heat resistant material. Alas, they wanted a 500 unit minimum. Most owners are too cheap for me to consider the idea.

I had some surge bottles made for the 2650 kits and I didn't sell them all to mustang owners. And it even took me 3 years years to sell the 6 that I did have to sell.

I am close to making some other products though.

 

[SH!FT]

harrop has them for $200
https://www.harrop-usa.com/ford-thermal-spacers/p139

Does $210 include the O-rings? I think Harrop was charging extra for O-rings when I was shopping for spacers.

 

[illtal]

Does $210 include the O-rings? I think Harrop was charging extra for O-rings when I was shopping for spacers.

The o-rings are made onto the spacers on the harrop units good sir.

 

[SH!FT]

I can't remember what brand that was. The o-ring upcharge was like $120.

 

[SH!FT]

I also looked into what they would cost to make before justifying my purchase.

For reference:
Below is what a sheet of generic material can cost. Not sure if a set of coyote spacers (turned 45*) will fit on a 1'x1' sheet.

The eBay spacer was probably made from a 3/4" thick sheet. Expecting a high quality 15mm spacer out of 5/8" would be risky.

Phenolic is not the easiest to machine. It's abrasive and its heat resistance throws the heat back at the cutting tool.

https://www.mcmaster.com/products/phenolic-sheets/

 

[BlownGP]

I also looked into what they would cost to make before justifying my purchase.

For reference:
Below is what a sheet of generic material can cost. Not sure if a set of coyote spacers (turned 45*) will fit on a 1'x1' sheet.

The eBay spacer was probably made from a 3/4" thick sheet. Expecting a high quality 15mm spacer out of 5/8" would be risky.

Phenolic is not the easiest to machine. It's abrasive and its heat resistance throws the heat back at the cutting tool.

https://www.mcmaster.com/products/phenolic-sheets/

Yes, any plastic type material can be tricky to cut.

I work in a machine shop but unfortunately we are setup to make round parts or I would have made them myself. We even make parts out of PTFE.

 

[TreeFiddyAre]

Serious boost/tuning question for the Coyote / Voodoo / Predator crowd:


When these motors are tuned under boost, do tuners add per-cylinder fuel bias, especially to the rear cylinders, to compensate for the additional heat from cramming more air into what’s typically the highest-pressure area of the intake? Or are we mostly relying on global fueling and knock control to keep everyone alive?

I’m going FI soon and have been wondering if anyone has gone full mad scientist and installed O₂ or EGT sensors per primary to see how evenly each hole is actually being fed. I can’t help but suspect there’s a measurable delta between the leanest and richest cylinders once boost enters the chat.

This also makes me curious whether certain intake manifolds do a better job at air distribution than others, or if we’re just accepting some imbalance as the cost of doing boosted business.

Honestly, I wish I had a disposable beater motor so I could conduct some garage science without financial consequences. I’ve even toyed with the idea of a direct-port water-meth setup, one nozzle per runner, sized to help normalize cylinder-to-cylinder fueling in the event the tune isn’t truly dialed per cylinder. I wouldn’t be shocked if the AFR spread is flirting with nearly a full point from richest to leanest under load.


For context (and to justify the insanity), I’ve done similar projects on:

• Two liter bikes set up for 9/10 mile work, optimizing for ram-air efficiency and effects. (delta of .7 -12.3 to 13.0, picked up 1.8mph went from consistent 198s to 199.7-.8mph consistently and about 0.5 second et
• A supercharged jet ski, which did run water-meth which worked really well as the delta was 1.3 points afr ( low was 11.6 high was 12.9) @ 17lbs of boost-TVS 1320,the cool lake water and a static CR of 8:8 helps them keep together but the delta was alarming

Different animals, obviously, but in both cases the added control produced real, measurable gains — and fewer “that sounded expensive” moments.


So… am I overthinking this, or is per-cylinder fueling the quiet hero nobody talks about until cylinder 7 o 8 asks for early retirement?

 

[nnnnnn]

I also looked into what they would cost to make before justifying my purchase.

For reference:
Below is what a sheet of generic material can cost. Not sure if a set of coyote spacers (turned 45*) will fit on a 1'x1' sheet.

The eBay spacer was probably made from a 3/4" thick sheet. Expecting a high quality 15mm spacer out of 5/8" would be risky.

Phenolic is not the easiest to machine. It's abrasive and its heat resistance throws the heat back at the cutting tool.

https://www.mcmaster.com/products/phenolic-sheets/

Exactly. At that thickness, price it's just more expensive.

Yes, any plastic type material can be tricky to cut.

I work in a machine shop but unfortunately we are setup to make round parts or I would have made them myself. We even make parts out of PTFE.

This 100% and 1000% all facts and is the truth.

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