OST-062: Mixed Breed Autocross Whip

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oldeskewltoy
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OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Wed Nov 06, 2019 2:54 pm

Anyone recognize the body lines???

Image


Does this one help??

Image



OST-062

Image



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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Thu Nov 07, 2019 11:13 am

from another forum wrote:Colt or Capri??


Capri????????

from another froum wrote:Modified, caged race car that shouldn't be driven in the rain?


not inaccurate....... but a bit vague.....


from another forum wrote:Looks like a 510


not too far off.....


from another forum wrote:It's quite hard to guess unless one knows the car very well.
I'd put 2c down on a early 70s Datsun (B110 Coupe). The only ones I know who had so much round from that time.



;)


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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Fri Nov 08, 2019 7:45 am

oldeskewltoy wrote:
Image



More to come....


While being in a competition type car... the engine was old and tired... and pretty dirty as well.....


The inside is dirtier then the outside.... :(

Image


Image


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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Tue Nov 12, 2019 4:21 pm

from another forum wrote:Brings up the question from my side: why the odd choice to swap a Toyota/Yamaha engine into a Nissan? Wouldn't a CA16DE have sufficed? :P

unsure... he may not have had one... or it may have been bigger, more difficult to fit... Or he come across a 4AGE and a T50 and went with it..... I do know he has a few moderately tired, or broken 4AGEs


and speaking about broken... he is one super luck S.O.B. this engine could have gone BOOM at any time with rod bearings this bad.......... notice bearings 2 and 3 are so worn... and in fact the bearing shell was so seriously distorted - it just popped/fell out of the rod cap upon disassembly.

Image

My machinist believes those journals will polish up :o


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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Thu Nov 14, 2019 4:34 pm

the head is back in my possession... so a bit of deburring to begin.....

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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Sat Nov 16, 2019 8:24 am

not a huge fan of 2nd gen largeport heads....... the flaws in this one are(were) pretty bad.... :(

Image


The 2nd gen castings don't seem to have the same port alignment as the earlier heads.... not saying that all the early heads are good... just that the later gen seems to have more "bad" ones....



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-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Sun Nov 17, 2019 5:54 pm

a more familiar view.....

1 down... 3 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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Re: OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Mon Nov 18, 2019 10:23 am

When I disassembled this engine, I had a real rough time removing the rear exhaust side head bolt. Once "broken" loose... it wasn't loose, it required me using the ratchet AND lifting the head at the same time to get the bolt free from the block. Once the head was free, the bolt had to be "gently" hammered free of the head using a drift. That head bolt may(likely) will need to be replaced. Special attention is being paid to making sure the threads inside are clean, and true

Image

So, the blocks surface back in that area is significantly "damaged", and a healthy block decking is in order to get the block true. Anticipate as much as .012" to be removed...........




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!

sirdeuce
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Re: OST-062: Mixed Breed Autocross Whip

Postby sirdeuce » Mon Nov 18, 2019 10:04 pm

That .012" might work well enough. I found a lot, if not most, aftermarket pistons are machined for a .010" lower compression height. That's for a good clean up on the block.
One shot, one kill.

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Re: OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Tue Nov 19, 2019 1:30 pm

sirdeuce wrote:That .012" might work well enough. I found a lot, if not most, aftermarket pistons are machined for a .010" lower compression height. That's for a good clean up on the block.


We shall see.... Cometic has soo many different thicknesses, it should be no problem setting squish between .032", and .036"


Further progress on the head.... 2 down......

intake....

Image


exhaust....

Image


Chambers....

Image




Working short radius for #4 intake valve

Image




before and after (apologies for fuzzy after pic) both bowls ported, and chamber deshrouded

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!

sirdeuce
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Re: OST-062: Mixed Breed Autocross Whip

Postby sirdeuce » Tue Nov 19, 2019 4:23 pm

Looking at that engine compartment again. Is there a reason for using a turbo manifold?? Clearance issues? Wouldn't a stock Corolla mani do a better job?
One shot, one kill.

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oldeskewltoy
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Re: OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Wed Nov 20, 2019 4:35 pm

sirdeuce wrote:Looking at that engine compartment again. Is there a reason for using a turbo manifold?? Clearance issues? Wouldn't a stock Corolla mani do a better job?



I BELIEVE a tube header can be made, but nothing available will fit. The Datsun uses a worm and roller type steering, and the steering arms (pitman arm, tie rod sections, and center link) interfere with anything off the shelf. While not desirable, this seems to "work".



3 down..........

intake...

Image


exhaust...

Image



and chambers......

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!

sirdeuce
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Posts: 687
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Location: Sierra Nevada foothills

Re: OST-062: Mixed Breed Autocross Whip

Postby sirdeuce » Wed Nov 20, 2019 5:45 pm

Maybe a FWD mani would do better, with the way turns back into the block would give the clearance to the steering box. At least it would have a better blended exhaust flow and remove a 180* bend. Fabbibg the downpipe would give a chance to tune the exhaust a bit as well. Just need a mani and downpipe flange.
Wish I could find an old car like that. Buddy has a Mango I've been trying to talk him out of.
One shot, one kill.

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oldeskewltoy
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Re: OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Mon Nov 25, 2019 3:35 pm

sirdeuce wrote:Maybe a FWD mani would do better, with the way turns back into the block would give the clearance to the steering box. At least it would have a better blended exhaust flow and remove a 180* bend. Fabbibg the downpipe would give a chance to tune the exhaust a bit as well. Just need a mani and downpipe flange.
Wish I could find an old car like that. Buddy has a Mango I've been trying to talk him out of.



I friend (whom passed away about 4 years ago) had a Datsun 1200 coupe with a 4AGE and a "proper" header... he had to have it built... and then some of the primaries were longer then others.... All the existing exhaust manifolds just don't fit.

4 chambers deshrouded

Image



4 intakes....

Image


and 4 exhausts....

Image



Its off to the machine shop for a fresh 3 angle, back cut the intake valves, and machine the surface .010"



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
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Posts: 1949
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: OST-062: Mixed Breed Autocross Whip

Postby oldeskewltoy » Tue Nov 26, 2019 8:54 am

from another forum wrote:
OST just out of curiosity how far can you deck a 4age block?


To be honest... I have no idea... I'm sure you can take as much as .020", maybe more. How thick is the thickest gasket??? Cometic has a .120" thick gasket.....?????


I've been told the block only needed .009" to get that area perfect again..... photo below shows corresponding bad area in head.

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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