What is Blacktop's intake valve closing event??

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1898
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

What is Blacktop's intake valve closing event??

Postby oldeskewltoy » Thu Feb 25, 2016 10:18 am

As the title suggests, I'm looking for the intake closing event for a stock Blacktop.


As an example... stock 16V cams have intake closing @ either 51(early), or 44(later)

Image


So, if you have a spec, or found one, for the stock Blacktop cams.... I'd greatly appreciated an answer...........


thanks in advance...
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!

Disable adblock

This site is supported by ads and donations.
If you see this text you are blocking our ads.
Please consider a Donation to support the site.


User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1898
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: What is Blacktop's intake valve closing event??

Postby oldeskewltoy » Thu Feb 25, 2016 10:39 am

think I may have found it.... although it doesn't specify if it is silvertop, or blacktop....


Image

http://www.catcams.com/products/camshaf ... TUP_id=837

Can anyone confirm these #s???
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!

jdm86gtz
Club4AG Expert
Posts: 306
Joined: Fri Jan 11, 2013 10:13 pm
Location: Ireland

Re: What is Blacktop's intake valve closing event??

Postby jdm86gtz » Thu Feb 25, 2016 2:48 pm

There's a table down a bit on Bill Sherwood's page listing the 20V cams
http://www.billzilla.org/4agstock.htm
I could have sworn I saw the specs listed on a Levin&Trueno magazine or something like that

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1898
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: What is Blacktop's intake valve closing event??

Postby oldeskewltoy » Thu Feb 25, 2016 5:41 pm

jdm86gtz wrote:There's a table down a bit on Bill Sherwood's page listing the 20V cams
http://www.billzilla.org/4agstock.htm
I could have sworn I saw the specs listed on a Levin&Trueno magazine or something like that



Bill does have a goof on his 16V cam timing.... compare his 16V smallport exhaust timing to Toyota's shown above. He shows the cams as being mirror of each other like the early cams are, where Toyota shows slightly changed cam timing...

This makes me feel that Bill's #s are close... but not necessarily accurate. I ASSUME Catcams measured.....????
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!

Disable adblock

This site is supported by ads and donations.
If you see this text you are blocking our ads.
Please consider a Donation to support the site.


burdickjp
Club4AG Expert
Posts: 343
Joined: Wed Jan 09, 2013 6:39 pm
Location: Richmond, VA

Re: What is Blacktop's intake valve closing event??

Postby burdickjp » Wed Mar 23, 2016 7:47 am

VVT on or VVT off?
Pursuing the ideal

User avatar
oldeskewltoy
Club4AG MASTER
Posts: 1898
Joined: Wed Jan 09, 2013 4:44 pm
Location: Portland, Oregon

Re: What is Blacktop's intake valve closing event??

Postby oldeskewltoy » Wed Mar 23, 2016 7:57 am

burdickjp wrote:VVT on or VVT off?


off was my original thought... but both couldn't hurt ;)
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!

burdickjp
Club4AG Expert
Posts: 343
Joined: Wed Jan 09, 2013 6:39 pm
Location: Richmond, VA

Re: What is Blacktop's intake valve closing event??

Postby burdickjp » Wed Mar 23, 2016 6:12 pm

I can't find my cam maps and my notebooks are buried from a move :(
From what I remember, Bill's timimng event numbers were within a few (2) degrees for VVT off on the OEM blacktop cams I've measured. I don't remember which way, though.
Pursuing the ideal

Disable adblock

This site is supported by ads and donations.
If you see this text you are blocking our ads.
Please consider a Donation to support the site.



Return to “TECH: 4A-GE ENGINE”

Who is online

Users browsing this forum: No registered users and 3 guests