What do you guys think the DCR should AT LEAST be on an N/A buildup?

Around 8.0 or so??

 

8.4-5 min or ya are leaving power on the table.
8.0 will still run OK just not as strong.

 

How big of a difference are we talking?

 

Depends on your cam.
Guess 10/15HP and torque.

 

Between 8 and 8.4-5?

 

8.4 to 8.5, the closer to 9.0 the better for the TQ & HP.
Lower than 8.4-8.5 ya probably gonna leave that 10/15 somewhere.

 

Don't worry about that. You can use the DCR to tweak the motor, but getting the cam events right and getting the best burn is the best way to go in terms of power and detonation resistance. I've had some stuff run very well at low DCR's, more would make them run faster. Look at Clints setup, 355, TFS heads and a CC306, that thing flies and he leaves a lot on the table in terms of DCR.

Bret

 

He might want the most he can get while he is getting!!!!!
Hell If it's just a head gasket WHY NOT.
Ya are right the more the FASTER and then get the cam to work with the inches and compression and intake flow and ya got it.

 

You know his DCR off hand?

Funny how some people have good luck with the 306 and others don't! His sh*t flies with it!

 

It would go faster with a different cam and more compression but it shows how the motor isin't the only part of the combination.

Bret

 

Bret, what do think is too LOW for DCR?

 

It has already been proven on here by MindGame and several others that 9.0 is doable on pump gas,on the street,and a couple had STOCK timing. Don't know what MG had for timing but it ran real good( 9.7's) so I wouldn't worry about the high end,I would worry about taking it below 8.5,IF ya want it to run like what it is.
Yea chassis makes up for some things but two cars with equal hook,same CID,equal weight, better have equal HP if they want to run side by side. Ya can't do that leaving much on the table.

 

I don't like anything below 7.5:1 really, but it all depends on the situation. Certain areas, and setups just can't run lots of it even when things are done correctly. I certainly don't like to pull timing just because of knock that's trying to pull the *** with the cart.

Yes, it's true you can and I have run 9.0:1 DCR on motors on the street, but even my LS that i'm building for myself will probably be in the low 11's for SCR and at the most 8.5:1 DCR. When you go flog the thing around Watkins Glen International on a 80deg day for 4 hours straight on whatever pump fuel you can get with 91+ octane, your requrements for DCR are a little different than the gas you get other places. I've had very good gas and bad gas, different times of year can have different specific gravities of gas and different states have different octane ratings to get their prefered mix so it depends on where you are. Personally I want to fill up anyplace and be able to cruise on the hwy in 6th and never take off the cruise control or get knock because the octane mix is not good for high vacuum low load situations. That will kill your motor faster than WOT knock.

Bret

 

Roger, copy that! Guess I'll shoot for around 8.0 and err to the high side if possible.


Bret, wanna spare some details on your LS buildup? This motor gonna have some CFE heads on it?

 

You also have to remember the LT1 is reversed flow cooled and the LS1 IS NOT.
This allows more static and DCR to be run without any consequences.