OST-053: Massaging a 20V Blacktop

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oldeskewltoy
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OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Thu Feb 14, 2019 4:14 pm

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My client asked me to overhaul his Blacktop (for his AE86). It comes to me with a spun #2 rod bearing (atypical, in my exp usually it's #4). The rod is toast, and the crank would need to be turned. "Would", not "will". My client isn't a fan of a turned crank, so we have ordered a new one. And as far as rods go, I have a set of re-worked TRD (20mm pins now) rods, that I'm selling him.


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here is the head during disassembly

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some grunge, but I've seen worse

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Here are the cleaned block, head, valves, and associated parts. Using the back of my car as a pick up......

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more to come..... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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kaosboss
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Re: OST-053: Massaging a 20V Blacktop

Postby kaosboss » Sun Feb 17, 2019 7:53 pm

What method did you use to get the head so clean?

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oldeskewltoy
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Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Tue Feb 19, 2019 7:13 am

kaosboss wrote:What method did you use to get the head so clean?


I work with a couple of machine shops, part of the fees in doing head work is a professional cleaning, and checking the casting for its pressure holding ability - make sure there are no porosity issues

from another forum wrote: Oooh, that's pretty neat.

What are the big advantages of going 20v over the stock 16v head? It seems like a lot of work to import for a mild gain.


There are 2 significant differences. The first is at lower level lifts, the intake side flows much better. At higher lifts, the flow tends to get closer, beginning to equalize. The second major difference is the exhaust size is significantly larger.

With that said... a ported 16V std valve head can be made to do everything, except equal the 20V @ low lifts.


having all the other projects now finished, or waiting on parts, I ficus on the Blacktop head - working the intake side first.


#1 in the right, #2 on the left.

Image


more to come.... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Thu Feb 21, 2019 8:40 am

further progress, this time on the exhaust side......

Image


more to come....... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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Jester_Borris
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Re: OST-053: Massaging a 20V Blacktop

Postby Jester_Borris » Fri Feb 22, 2019 9:15 pm

Excellent work as alway OST. I’m finally able to revisit my Blacktop project of 7 years ago. This is inspiring - makes me want to get on it.
1986 AE86 - 20V Silvertop 4A-GE w/ Blacktop ECU

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oldeskewltoy
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Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Wed Feb 27, 2019 8:06 am

Jester_Borris wrote:Excellent work as alway OST. I’m finally able to revisit my Blacktop project of 7 years ago. This is inspiring - makes me want to get on it.


any inspiration I can help with is all good!


sometimes... it helps to see from a different POV...... I've added a photo to the above multi-panel



Image

for the sharp of eye who follow my work, the above castings are from OST-034, but they still hold true...... as before, and after exhaust porting on a Blacktop head.


More to come...... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

cincybranr
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Re: OST-053: Massaging a 20V Blacktop

Postby cincybranr » Wed Feb 27, 2019 3:40 pm

Subscribed! Awesome!!

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oldeskewltoy
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Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Thu Feb 28, 2019 8:44 am

from another forum wrote:What is your honest feedback on the TRD conrods for the 20v?

I know i need to rebuild my 20V, not sure if bore walls are STD, if not, big pistons will follow and obviously new conrods (just because).

Not sure what to purchase...


I've had this set of rods for a while... in fact this set's been to Europe and back (sold, and then returned). BUT you don't need to spend BIG money for decent rods. While I have only this anecdotal experience with blacktop rods, this engine's bearings appear to just be old worn out parts - all the bearings were pretty bad. But for the most part OEM rods are plenty strong. As an example of stock rod durability, my smallport is running a 40mm rod journal crank and stock 3 rib 40mm rod journal rods - albeit with new bolts. I'm making 140 ish whp, and I twist it regularly up to 7500+ and it now has over 30k miles on it.

But if you just want better (stronger, and lighter) rods, I usually recommend Molnar Technologies. They run about $450 per set.

Image


Port work continues.... 2 down.... 2 to go

Image


more to come.... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Posts: 1829
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Fri Mar 01, 2019 8:59 am

Image


more to come.... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1829
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-053: Massaging a 20V Blacktop

Postby oldeskewltoy » Sat Mar 09, 2019 3:04 pm

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3 down... 1 to go....


Time to set up the flowbench, and get some #s........

Image



More to come...... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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