Dyno Results: - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 (permalink) Old 08-21-2014, 10:12 PM Thread Starter
 
Join Date: Jul 2012
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Dyno Results:

dyno results
I have purchased a 1968 YH block 428 375 hp engine, it has 3 angle valve job with 6x heads being hogged out to 2.18 and 1.89 I have headers and 1966 tripower stock and cam reads 474 lift with 304/296 duration compression has been lowered to 10.1 My question is what do you think estimated horsepower/torque would be for this engine. Someday I will get to a dyno for real results. Thanks!
ottfive is online now Forward Message
ottfive is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old 08-22-2014, 05:53 AM
 
RunninLeMans's Avatar
 
Join Date: Apr 2014
Location: Maine
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Do you have the 0.050" duration for the cam? I'll run this combo on the dyno simulator.
RunninLeMans is offline  
post #3 of 19 (permalink) Old 08-22-2014, 09:33 AM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,491
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Don't know about power numbers, but you will need race gas for that engine at 10:1 with iron heads.
geeteeohguy is offline  
 
post #4 of 19 (permalink) Old 08-22-2014, 09:54 PM Thread Starter
 
Join Date: Jul 2012
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Exhaust is 2.5 3 angle valve job, no mention of head port rocker ratio 1.50,
Cam specs;ERSON degrees of duration 228 235 intake open 38 overlap 81 exhaust closes 43 intake closes 78 exh opens 83 valve lift int .472 296/306 exh valve lift .472 exh gr lift 315 degreeing cam int open 4 tdc overlap 11.5 exh close 44 exh open 47.5 gr lift intake .315 Thanks for any info you can give me!
ottfive is offline  
post #5 of 19 (permalink) Old 08-22-2014, 09:57 PM Thread Starter
 
Join Date: Jul 2012
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I've been running 93 octane with booster with no problems yet, it does have harden valve guides for todays gas. Any one else running this comp ratio had any problems?
ottfive is offline  
post #6 of 19 (permalink) Old 08-23-2014, 09:27 AM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,737
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
You could be getting lucky. Still, I'd heartily recommend that you frequently inspect your spark plug tips using a magnifying glass, looking for "shiny specks" until you're sure you're not having problems. There is such a thing as detonation that isn't pronounced enough for you to hear as knocks, but can still chew up your piston tops (where the shiny specks come from) over time.

I think you may have meant hardened valve seats, not guides, yes?

It's pretty unusual for someone to be able to run at 10:1 with iron heads and pump gas without having problems.

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #7 of 19 (permalink) Old 08-23-2014, 10:40 AM Thread Starter
 
Join Date: Jul 2012
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks Bear,
I will check and yes I meant hardened valve seats. Would a 9:5 0r 9:1 comp ratio be recommend for today's gas? Or what octane racing gas should I use with current 10:1 ratio? Thanks for your help!
ottfive is offline  
post #8 of 19 (permalink) Old 08-23-2014, 01:10 PM Thread Starter
 
Join Date: Jul 2012
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Exhaust is 2.5 3 angle valve job, no mention of head port rocker ratio 1.50,
Cam specs;ERSON degrees of duration 228 235 intake open 38 overlap 81 exhaust closes 43 intake closes 78 exh opens 83 valve lift int .472 296/306 exh valve lift .472 exh gr lift 315 degreeing cam int open 4 tdc overlap 11.5 exh close 44 exh open 47.5 gr lift intake .315 Thanks for any info you can give me!
ottfive is offline  
post #9 of 19 (permalink) Old 08-24-2014, 08:14 PM
 
RunninLeMans's Avatar
 
Join Date: Apr 2014
Location: Maine
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Sorry for the delay, bud, gone for the weekend. I had to rough in a couple things, no tri-power in my data base, but with an 800 cfm Holley double-pumper and the rest of what you gave us I get 432 hp @ 5250 rpm and 479 ft-lbs @ 3500 rpm. I've run a few engine builds with actual dyno results on this software and it's usually a little optimistic, but you still got a healthy motor there. Maybe one of the real engine builders has better tools...

Scott
RunninLeMans is offline  
post #10 of 19 (permalink) Old 08-24-2014, 08:20 PM
 
RunninLeMans's Avatar
 
Join Date: Apr 2014
Location: Maine
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Bear, you think that late-closing intake valve is helping him out with lower dynamic compression in spite of the 10:1 static number? I get 7.1:1 with the Wallace Racing calculator, ain't that in the okay range for 93 octane?
RunninLeMans is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Dyno Results Dr.Goat 2004-2006 GTO General Discussion 3 06-03-2014 07:02 AM
dyno results JUSTIN4102 2004-2006 GTO General Discussion 14 04-25-2011 10:23 PM
Dyno Results Audi Killer 2004-2006 GTO General Discussion 9 04-10-2011 12:37 PM
04 A4 Dyno Results TORNATIC!! Engine Discussions 17 11-15-2007 04:31 PM
Dyno results! 6QTS11OZ Engine Discussions 21 10-06-2006 03:32 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome