Tim's engine, and the following report is the real world from several
different points of view.
First, look at his build up at
http://www.tigersunited.com/techtips/Ronak350Lunati/pt-Ronak350Lunati1.asp.
This is one of the best, most professionally built engines I have ever
seen. All the right parts, and put together the right way.
Second, the engine was dyno tuned, to obtain it maximum hp and torque.
Too many people throw parts at an engine and then do not maximize it's
potential with a dyno tune. Even a stock engine can gain significant
power with a good dyno tune.
All the talk about size of carbs, really means nothing unless the
accelerator pump and jets are correct for that engine and that car.
Finally, I have to chuckle at the comments from some owners, especially
those selling their cars, of claimed hp and usually not torque
estimates, as they are mostly a wet dream. Adding a cam, a Holley, a
whatever, and then adding the claimed hp gains from the marketing people
without looking at your application, is again a wet dream.
If you read the hot rod magazines, especially those who do dyno test,
you most often see the owner greatly over estimating their hp and
torque, and often with some very expensive and fancy additions.
If you really want to spend your money wisely, they get your engine dyno
tuned. Look at the gains over the before and after and then you can
really brag and have something, the dyno sheet to back up your statements.
Tim, did a great job, and laid it all out for us to see. So thanks Tim,
for sharing your excellent work and impressive results.
Larry
Ronak, TP (Timothy) wrote:
>Listers - Dave,
>I hate to be the one to dispel myths but my 347 ish engine (really it is
>349.6) .030 over with a 3.425 inch stroke lunati crank instead of the 3.4"
>crank in the 347 ... do the math.
>IT Does not suck a drop of oil. Even on the dyno there was no smoke at all
>on or off the throttle.
>There is a bit of piston slap when cold but nothing I can't live with until
>I build a new engine for more power when this one wears out.
>For what it is worth it made 360HP at the wheels with 388lb ft of torque.
>This translates with 18% drivetrain losses to 439 HP and 473 lb.ft. with
>full 2" exhaust dynomax quiet mufflers and all of the accessories installed
>pumping water through a rad with pump gas. TFS Heads and a RPM performer
>intake. Pretty basic stuff.
>The cam is the trick flow specialties stage 2 hydraulic roller cam pt number
>TFS-51402001 with roller rockers. If you want the exact specs then ... Cam
>timing and specs are as follows with 1.6 ratio rocker:
>Intake @ valve .542 lift ,
>Exhaust @ valve .563 lift
>Advertised duration @ .004 valve lift Intake is 286 degrees and exhaust is
>294 degrees.
>Cam timing @ .050 for those that care is
>Intake opens @ 5.0 Degrees BTDC and closes @ 39.0 degree ABDC ,
>Exhaust opens @ 53.0 degrees and closes @ (1.0) (that would be -1) BTDC ,
>Max lift Intake @ 107 ATDC Max lift Exhaust 117 BTDC,
>Intake duration @ 0.50 is 224 degrees and
>Exhaust duration @ .050 is 232 degrees.
>
>Key Point Peak horsepower is around 5400 RPM (you don't scatter engine parts
>at that RPM) and peak Torque around 4300 RPM ... 300+ lb. ft from 3000 RPM
>to 5400 RPM. It is a real tire smoker.
>
>I can email a scan of the dyno sheet for those who want it.
>
>Best Regards,
>
>Tim Ronak
>Business Development Manager
>Akzo Nobel Coatings
>23961 Via El Rocio
>Mission Viejo, CA 92691
>Off: (949) 305-5393
>Fx: (425) 955-6268
>Cell: (949) 289-3357
>email: timothy.ronak@akzonobel.com
>VM: (800) 234-6747 ext. 2257#
>
>This message, including attachments, is confidential and may be privileged.
>If you are not an intended recipient, please notify the sender then delete
>and destroy the original message and all copies. You should not copy,
>forward and/or disclose this message, in whole or in part, without
>permission of the sender.
|