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Topic Review (Newest First)
04-05-2012 10:33 AM
Raptorus1
How much power will should i make?

Thanks for all the info! Im leaving the 906's at 64cc and I decided on a lunati bare bones 280/290 Duration, .443"/.465" Lift, 112/107 LSA/ICL. Also im getting some 5cc 4v relief flat tops. Using a GMPP composite head gasket .028 compressed. Static compression should be in the 9.8-10:1 range DCR about 7.8-8 which i can live with. If i can get 350hp out of it ill be happy.
04-03-2012 10:25 AM
my87Z i dont typically recomend Comp cams but these would be a decent fit.

http://www.summitracing.com/parts/CCA-12-238-2/

or

http://www.summitracing.com/parts/CCA-12-210-2/


they will have a little lobe, not a lot.

i dont hear you saying that you are changing you gears, stall... so you can't go with a cam that has a bunch of lope, everything has to go together. if you want a loppy cam you will need shorter gears (larger numerically) and a higher stall. and i have mentioned this before, buying a torque converter with a stall speed less than 2800 is pointless in my opinion. if you are willing to spend the money to put in a 2800-3200 stall and put in a set of 3.73-4.10 gears then i would say you could go with a higher duration cam but if not, you will need to stick with a cam in the 260 maybe 270 range, and for a hyd flat tappet cam i wouldn't use one that had to much than 50 between the advertised and @ .050 durations. i know that the first cam i posted does but it also has a lower lift which brings the ramp rate down.
04-03-2012 10:06 AM
my87Z [QUOTE=Raptorus1][QUOTE=my87Z] the factory dished pistons are what is acutally hurting you since you are acutally loosing power due to there not being a propper quench pad.
Quote:
Originally Posted by my87Z

Second question is there a design fault in the factor piston? by the calculations i have the quench would be about .065 which within the optimal range of .06-.08 correct me if im wrong.

that is not exactly what i was talking about. i was talking about the fact that factory dished pistons are O shaped and dont have a flat side to them the way that D dished pistons do, this flat area at the back side of the D is called the quench pad, this is were much of the combustion will be focused on since it will be more compressed than in the dish, in a O dished pistons the "quench pad is acutally in the O and therefor is less compressed, this causes less combustion and more fuel to be unburt.

as for a proper quench, the area from the flat part of the piston crown at TDC to the head surface, .038-.046" is optimal. most people shoot for around .040-.042".
04-03-2012 10:03 AM
Silver Surfer
Quote:
Originally Posted by my87Z
Second question is there a design fault in the factor piston? by the calculations i have the quench would be about .065 which within the optimal range of .06-.08 correct me if im wrong.
I think what he is saying is that only flat top and D-dish pistons will provide the best/adequate quench. They are flat on top where they fit directly underneath the flat part of the head (ie not the combustion chamber). I think the rule of thumb is that 1/3 of the piston should provide quenching action (or maybe its 2/3, I forgot).

A dished piston will have a little rim around the outer edge of the piston. The little rim is not enough surface area to cause a violent squishing action of the charge over into the combustion chamber area. Nor is is a large enough surface to help transfer heat from the piston to the cooler head.

Deck clearance and squish are not always a direct relationship.
04-03-2012 09:59 AM
my87Z the flat top pistons will be pushing your compression to the point where it will be harder to run to pump gas, it could be possible but not as easy. the flat tops will have you at around 10.4-.5:1 but the -12cc dished pistons will have you at around 9.5-.6:1. but all of that is based on them being 64cc and not milled down to 58cc. if they have really already been milled down then you will need to go with a -18cc dished piston, which then your compression would be the same as the 12cc with a 64cc head.

here are the 12cc pistons i would recomend.

http://www.summitracing.com/parts/UEM-KB193-030/

but if the chambers are milled down to 58cc then you will want these 18cc

http://www.summitracing.com/parts/UEM-KB142-030/

with these pistons you must follow the directions that comes with them pertaining to the piston rings and their specific gaps, that is very important.
04-03-2012 09:58 AM
Raptorus1 [QUOTE=my87Z] the factory dished pistons are what is acutally hurting you since you are acutally loosing power due to there not being a propper quench pad.[QUOTE=my87Z]

Second question is there a design fault in the factor piston? by the calculations i have the quench would be about .065 which within the optimal range of .06-.08 correct me if im wrong.
04-03-2012 09:22 AM
Raptorus1
How much power will should i make?

You know my87Z you do have a serious point. Those factory pistons have been keeping me up wondering if its a good move to keep them. I am lucky that I havent installed the vortecs yet. Im thinking about some flat tops (2 or 4 valve relief ??)for this setup. My hope is to keep the dynamic compression low enough to stay on pump gas though. As far as the cam goes that dept is my definite weakness. Im needing to get a cam that will get all i can out of it from about idle to 5500 and have a pretty notcible idle. any suggestions?
04-03-2012 07:13 AM
my87Z 454C10 i think got confused as we both were commenting on a 305 motor the other day, the LO3 is a 305 and the LO5 is a 350.

to be honest i dont care for the cam you have chosen, it has an extemely aggressive ramp rate for a hyd flat tappet cam. i would be very weary of wiping out the cam with that aggressive of a ramp rate.

if i had to guess then i would say that you are in the 1hp/cube range. the factory dished pistons are what is acutally hurting you since you are acutally loosing power due to there not being a propper quench pad. if you where to have gone with a 12cc dished piston like the ones from KeithBlack and the factory 64cc vortec chambered heads you would likely be in the 380ish hp range
04-02-2012 04:57 AM
454C10 For a good estimate, I would find the power numbers from a similar built 350 then Multiply by 0.87.

305/350 = 0.87

So assuming that would be a 340hp build in a 350cid, then it would be a 295hp build with a 305cid.
04-01-2012 07:59 PM
Raptorus1
How much power will should i make?

Im wondering how much power I should be making with this build I have going. Its a 88 L05 350 I kept the stock bottom end dished pistons and all in tact. I am changing the cam to (top candidate) a lunati Voodoo w/ adv. dur of 268/276, Duration @ .050 (Int/Exh): 227/233 and .489/.504 lift. I scrapped the 193's in favor of 906 vortecs which have been reworked. They will accept .550 lift and they have been milled down to 58cc. Using a edelbrock 2116 intake and holley 750 carb. by my calculations compression should be close to 9.7 to 1. Just trying to get a general estimate on power output. Thanks for any help.

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