| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
02-10-2002, 04:37 AM
|
|||
|
|||
and stock rod bolts?
|
|
#2
02-10-2002, 04:37 AM
|
|||
|
|||
|
and stock rod bolts?
|
|
#3
02-10-2002, 09:39 AM
|
|||
|
|||
|
Shouldn't be a problem.Lots of stock engines up to 1970 had compresion ratios above 10:1.
Tom |
|
#4
02-10-2002, 09:39 AM
|
||||
|
||||
|
You probably should't run over 10 to 1 with iron heads unless you plan on running 110 octane. If you don't plan on running it hard all the time it will live.
|
|
#5
02-10-2002, 10:15 AM
|
||||
|
||||
|
It is not the CR that is hard on parts but detonation. Run the octane you need for 10:1 and you will be fine.
|
|
#6
02-10-2002, 11:28 AM
|
||||
|
||||
|
I run 10.3 cr (measured) with a .015" deck, iron heads. I run 93 octane on the street with stock rods and ARP bolts, 50/50 mix at the track. I don't think I'm experiencing any or much detonation, definitely nothing at the track (run through the exhaust). I checked my bearings for signs of detonation this fall when I put the car away and everything looks perfect. I run 32 degrees total timing, the car never runs over 195 degrees on a 100 degree summer day in traffic.
__________________
1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
|
#7
02-10-2002, 12:43 PM
|
||||
|
||||
|
The factory made nearly all of the normal engines 10.5 cr. So 10:1 should be fine. I have run many 10.5 engines for years without problems. However you end up retarding the timing and running premium and race gas. [img]tongue.gif[/img]
__________________
Try calling CRUSHPROOF! 512-386-9889 |
|
#8
02-10-2002, 01:59 PM
|
||||
|
||||
|
The rods will be fine. As for the compression ratio on the street...I ran over 10:1 for about 4 years of daily driving. I tore the engine down recently and found no signs of abnormal wear. Once I put my MSD 6A on, I didn't have to retard the ignition so much and it would only knock a little under extreme conditions. I would recommend an MSD when running high comp carbed engine on pump gas.
__________________
70 LeMans Sport 95 Corvette 07 F350 Crew Cab 4x4 |
|
#9
02-10-2002, 02:33 PM
|
||||
|
||||
|
High RPM, worn bearings, poor balance and assembly are generally what will puke a rod. Think about the effective compression ratio (cylinder pressure) when you spray a motor? Lot's of guys are running nitrous with cast rods. I run 11.6:1 with cast rods, 6,000 RPM with a 455, no problems. The shortblock has been together for 7 years. I have seen people run upwards of 13:1 with stock rods. At some level of performance, forged rods are good insurance. I personally would use ARP bolts if you are planning to use the stock rods.
__________________
Tempest455 |
|
#10
02-10-2002, 05:36 PM
|
||||
|
||||
|
Eric D. Can you send me the picture on your last post. tvaught@ford.com I would like to use it on my screen saver if ok with you. Tom
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
