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-   -   Darton sleeved 427 w/ L92 heads project begins (https://www.corvetteforum.com/forums/c5-tech/2504538-darton-sleeved-427-w-l92-heads-project-begins.html)

Blorton 02-14-2010 10:32 AM


Originally Posted by WKMCD (Post 1573093574)
Too much maintenance. Years ago I ran dual Webers on a BMW. If you wanted it to start in the morning you had to adjust them the night before. If you wanted it to run all day you had to adjust them in the morning.. :ack:

Ahh! A kindred spirit! :cheers:

Another passion of mine is motorcycling, and the carb/tb synchronizing maintenance has always been a fun maintenance item. Using the carbtune with floating steel rods instead of mercury sticks makes things a lot safer. :D

Anyways, I obviously cannot comment on the Harrop's relative stability, but most of the current multi-tb bike setups maintain alignment for at least 16k miles. I've kicked around making my own itb setup for the C5, but just haven't gotten "roundtuit".

Cheers!
Dan

WKMCD 02-14-2010 11:37 AM


Originally Posted by Blorton (Post 1573094673)
Ahh! A kindred spirit! :cheers:

Another passion of mine is motorcycling, and the carb/tb synchronizing maintenance has always been a fun maintenance item. Using the carbtune with floating steel rods instead of mercury sticks makes things a lot safer. :D

Anyways, I obviously cannot comment on the Harrop's relative stability, but most of the current multi-tb bike setups maintain alignment for at least 16k miles. I've kicked around making my own itb setup for the C5, but just haven't gotten "roundtuit".

Cheers!
Dan

It's exactly my experience years ago with 4 and 6 cylinder motorcylces that keeps me from thinking about an ITB setup for my cruiser.

WKMCD 02-14-2010 01:36 PM

Got some flow numbers for the Stage 3 L92/LS3 heads from Richard at West Coast Cylinder Heads (proheads.com)

Damn Richard,

These look like LS7 numbers...:D

http://i54.photobucket.com/albums/g9...tflowchart.jpg

Here is the difference in the WCCH Stage 2 heads I was running with the 403 and the Stage 3 heads for the 427.
Got some flow numbers for the Stage 3 L92/LS3 heads from Richard at West Coast Cylinder Heads (proheads.com)

http://i54.photobucket.com/albums/g9...2flowchart.jpg

http://i54.photobucket.com/albums/g9...tflowchart.jpg

WKMCD 02-15-2010 12:09 PM

Flow Charts for my actual heads from Richard. Nice increase from Stage 2 to Stage 3.

http://i54.photobucket.com/albums/g9.../FlowScan2.jpg

http://i54.photobucket.com/albums/g9...wScan1jpeg.jpg

edcmat-l1 02-15-2010 12:36 PM

Now we need a .700 lift cam. :willy: :reddevil

Blorton 02-15-2010 01:09 PM


Originally Posted by edcmat-l1 (Post 1573106883)
Now we need a .700 lift cam. :willy: :reddevil

Those sweet motors you guys build sure come with deep enough valve reliefs in the pistons to support that. :thumbs:

WKMCD 02-15-2010 06:33 PM


Originally Posted by edcmat-l1 (Post 1573106883)
Now we need a .700 lift cam. :willy: :reddevil

People would be surprised if they knew how much lift I've been running. :crazy: :D

iced98lx 02-15-2010 11:29 PM


Originally Posted by WKMCD (Post 1573111119)
People would be surprised if they knew how much lift I've been running. :crazy: :D

LOL

seriously though, I'd like to see you running the Harrop.. call it an 'experiment' and inform the wife of the impending purchase.. ;)

miami993c297 02-16-2010 06:42 AM


Originally Posted by iced98lx (Post 1573115024)
LOL

seriously though, I'd like to see you running the Harrop.. call it an 'experiment' and inform the wife of the impending purchase.. ;)

Hi Kevin,

Having you running the Harrop would be like a validation for this product on a D.D. ...
Until then I am considering the Harrop as a racing intake, with no R&D about air filter and air boxes beeing used in a Corvette in a Daily Driver environment...

Some argument on your side to debate with the manufactor and distributor about this product if they want to sell in this specific segment of the high performance D.D. intake for Corvette...

Christian

WKMCD 02-16-2010 06:07 PM


Originally Posted by iced98lx (Post 1573115024)
LOL

seriously though, I'd like to see you running the Harrop.. call it an 'experiment' and inform the wife of the impending purchase.. ;)

The Harrop would be very cool....and what makes you think I inform the wife of any of this...:rofl:

PS: She really doesn't care. As she will admit, there are many worse things I could be doing.....and probably have done in the distant past.

WKMCD 02-16-2010 06:09 PM


Originally Posted by miami993c297 (Post 1573116335)
Hi Kevin,

Having you running the Harrop would be like a validation for this product on a D.D. ...
Until then I am considering the Harrop as a racing intake, with no R&D about air filter and air boxes beeing used in a Corvette in a Daily Driver environment...

Some argument on your side to debate with the manufactor and distributor about this product if they want to sell in this specific segment of the high performance D.D. intake for Corvette...

Christian

Sounds great Christian. Why don't you give them a call and see if they'll comp us one each for rectangle and and cathedral port heads.

I'll sit here and hold my breath. :)

iced98lx 02-16-2010 11:55 PM


Originally Posted by WKMCD (Post 1573123004)
The Harrop would be very cool....and what makes you think I inform the wife of any of this...:rofl:

PS: She really doesn't care. As she will admit, there are many worse things I could be doing.....and probably have done in the distant past.

:willy::rofl:

WKMCD 02-18-2010 11:51 AM

We're only here for the engine porn... :D

http://i54.photobucket.com/albums/g9...ithoutpics.gif

edcmat-l1 02-19-2010 03:22 PM

Bumpage......

WKMCD 02-19-2010 05:11 PM


Originally Posted by edcmat-l1 (Post 1573157561)
Bumpage......

http://i54.photobucket.com/albums/g9...Belly_Bump.gif

WKMCD 02-20-2010 07:48 PM

Hey Shawn,

Man you really surprised me when we got there today to find you sitting at the engine dyno controls and my 427 loaded up on the dyno. I didn't expect that.

Anyways, the numbers...These are preliminary numbers. Ed didn't get a chance to finalize the tune and the engine was still running the w40 breakin oil. The motor has been run a total of about 5 minutes so far including the dyno pulls and never run over 6k RPM.

Early results are 605 HP at 5900RPM and 588 T at 4800. I think we're all pretty happy with the early numbers. Shawn said he usually sees about 75hp difference between his engine dyno and his DJ. Shawn has another cam ...still small by anyone's standards for a 427. Let's see how that works. Shawn also wants to take a run at making power with the FAST 102. He's confident he can make it work. The goal remains the same - good power but not at the expense of drivability. That's the challenge.

The engine is very quiet mechanically. Much quieter than before.

It was a GREAT day. McLeod and Sneakelman made the 390 mile round trip with me and Brian - Cobra4B - stopped by for the show.

Here are a few pics.

Shawn and Ed at work.
http://i54.photobucket.com/albums/g9...ngineDyno1.jpg

http://i54.photobucket.com/albums/g9...ngineDyno4.jpg

http://i54.photobucket.com/albums/g9...ngineDyno2.jpg

The BEAST!
http://i54.photobucket.com/albums/g9...ngineDyno5.jpg

http://i54.photobucket.com/albums/g9...ngineDyno3.jpg

Tough to get pics of the gauges when max'd. Note the RPM.

http://i54.photobucket.com/albums/g9...ngineDyno6.jpg

allngn_c5 02-20-2010 10:42 PM

Very nice to hear Kevin !

Prelim numbers look great. Can't wait until you spin that sucker up to 6500 Rpms and just beyond.

Looking fwd to the next update !

phils C5 vette 02-20-2010 11:35 PM

im still seeing 600/600 plus

iced98lx 02-21-2010 12:35 AM

:cheers: this thing is going to be a true beast!

WKMCD 02-21-2010 08:06 AM


Originally Posted by phils C5 vette (Post 1573173265)
im still seeing 600/600 plus

I'm sure with another couple of pulls it would have made you happy. :)


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