What did you do to your Hellcat today?

[ACMAVRO]

Had hood wrapped in satin black. They did a great job…matches the rear spoiler perfectly.

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Looks great! I have been really, really close to doing this on my white hc also

 

[16GoManGoHC2]

Put new pistons in the freshly honed block

 

[16GoManGoHC2]

Changing valve springs, retainers, locks and seals today. Hopefully putting heads back on this week.

 

[coolblue]

Changing valve springs, retainers, locks and seals today. Hopefully putting heads back View attachment 47132 View attachment 47133 View attachment 47134 View attachment 47135 View attachment 47136 on this week.

Springs look stout. What's open and closed psi compared to stock?

 

[Hpindy]

Replaced the rubber coupler from the air box to ther throttle body .
Due to the 105mm throttle body and the FI spacers the rubber coupler that came in the kit looked like a 5 lbs cat in a 2 lbs bag .
This fits much smoother .

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[DGatzby]

The transplant arrived at the rest home, and we like it, all the offending shit has been removed now, the patient continues to be supported by four steel posts, but we are very optimistic now concerning a recovery in the next couple of weeks.

 

[16GoManGoHC2]

Springs look stout. What's open and closed psi compared to stock?

Stock springs 115 lbs seat load at 2.051”, 337 lbs open at 1.480” Rate 389
New springs 136 lbs seat at 1.800, 412 lbs at 1.170 Rate 438
Interestingly the new springs weigh only about 1/2 the weight of stock springs 114g stock 62g new, but retainers are 3 grams heavier then stock 9g verse 12g new.
I’ll be testing all the old springs at some point and see if they weakened and if their even to one another or not both at the seat and open.
New springs good for .630 lift.

 

[Hunter]

Looks great! I have been really, really close to doing this on my white hc also

That would look amazing.
Then you would need to do it to the DSRT.

 

[ACMAVRO]

That would look amazing.
Then you would need to do it to the DSRT.

I know but the wife’s not a fan🙄

 

[Hickster]

hard to deal with,, noted as a tragedy.

 

[16GoManGoHC2]

One done one to go. Takes FOREVER when you measure every freaking thing, check everything for straightness, polish and clean the valves and pockets but that MMT from octane booster just had to go. Thank God my cats going to be a vegetarian from now on.

 

[Diboblo]

One done one to go. Takes FOREVER when you measure every freaking thing, check everything for straightness, polish and clean the valves and pockets but that MMT from octane booster just had to go. Thank God my cats going to be a vegetarian from now on. View attachment 47183 View attachment 47184 View attachment 47185 View attachment 47186 View attachment 47187 View attachment 47188 View attachment 47189

Man... brings back memories, from when I did cam and heads, on my 6.1. New PSI springs, hand lapped the valves, deep cleaned everything, tested and shimmed every spring... loads of work. Worth the effort.

Nice job and thanks for the updates!

Bob

 

[BULL]

One done one to go. Takes FOREVER when you measure every freaking thing, check everything for straightness, polish and clean the valves and pockets but that MMT from octane booster just had to go. Thank God my cats going to be a vegetarian from now on. View attachment 47183 View attachment 47184 View attachment 47185 View attachment 47186 View attachment 47187 View attachment 47188 View attachment 47189

Just so I don't say something stupid, in this last image, the close up of the valve and the seat, what stage of processing are you at? What are you showing here?

 

[coolblue]

One done one to go. Takes FOREVER when you measure every freaking thing, check everything for straightness, polish and clean the valves and pockets but that MMT from octane booster just had to go. Thank God my cats going to be a vegetarian from now on. View attachment 47183 View attachment 47184 View attachment 47185 View attachment 47186 View attachment 47187 View attachment 47188 View attachment 47189

Just got back to this thread. On earlier various post that you put up about the MMT buildup and considerations, I really didn't think it was a big deal BUT on that 3'rd picture down from top with the two exhaust valves side by side you can see MMT deposits on the SEAT. Now that can lead to hot spots and buildup a flame could travel through and burnt valves, plus at the least, the loss of compression from 'burping' through dirty seat with enough buildup. I thought it was just a covering of the chamber and valve surfaces and an aesthetic issue, that's why I was thinking no big deal. But now...I think I'm off the additive. EXCELLENT info and photos as usual.

 

[16GoManGoHC2]

Just got back to this thread. On earlier various post that you put up about the MMT buildup and considerations, I really didn't think it was a big deal BUT on that 3'rd picture down from top with the two exhaust valves side by side you can see MMT deposits on the SEAT. Now that can lead to hot spots and buildup a flame could travel through and burnt valves, plus at the least, the loss of compression from 'burping' through dirty seat with enough buildup. I thought it was just a covering of the chamber and valve surfaces and an aesthetic issue, that's why I was thinking no big deal. But now...I think I'm off the additive. EXCELLENT info and photos as usual.

You are Absolutely correct, the biggest detriment here is/was the MMT on the valve seats, it’s why I posted such pictures. I won’t be using octane boosting additives when spraying on my Capri any longer either. I found I can get 98 octane Sunoco Unleaded gasoline at Pocono which is only 45 minutes away so I’ll be visiting there here and there with 5 gallon VP cans for good fuel for it. The cat will drink nothing but E85 now so bye bye MMT based additives in my world as well, seeing the valve seats “sealed” the deal there.

 

[16GoManGoHC2]

Just so I don't say something stupid, in this last image, the close up of the valve and the seat, what stage of processing are you at? What are you showing here?

This picture?

It’s showing the lapped seat area on the valve and in the head cleaned of MMT deposits. The grey colored areas on valve and seat are the freshly lapped areas

 

[BULL]

This picture?
View attachment 47392
It’s showing the lapped seat area on the valve and in the head cleaned of MMT deposits. The grey colored areas on valve and seat are the freshly lapped areas

It appears as though there are some hard carbon spots remaining in the contact area on the valve?

3oclock position?

 

[16GoManGoHC2]

It appears as though there are some hard carbon spots remaining in the contact area on the valve?

3oclock position?

Their actually divots in the seat area created by thicker spots of build up that impressed themselves into the softer then the seat valve. They don’t span the seal face so they won’t create any sealing issues, they will fill in with carbon and become smooth again. Lapping could have continued until they where removed but that would have taken more material off the valve them wanted and was unnecessary to do.

 

[16GoManGoHC2]

It appears as though there are some hard carbon spots remaining in the contact area on the valve?

3oclock position?

Most everyone cleaned up perfectly and looked like this one,

that one was picked to show the extreme damage MMT can cause.
Good eye!!

 

[DGatzby]

Released from the rest home after one month and a day; back to the wild and my hands. Complete recovery, a real engine break-in is in progress, warranty continues Give me a couple weeks and I tell ya if it runs any different. I know the exhaust is a bunch more quiet with new cats.