combination
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From: conway arkansas
combination
i wanna lay out my combo that i'm fixin to start puttin together and get some scrutiny on the deal, first its a 400 bored .060 with TMI zero deck pistons, mild bowl and exhaust port work on the 2bbl heads, got 7/16 screw in studs and roller rockers, runnin a crane PN-133042 its a .542 lift with a 272 degree adv duration, also has a weiend #8010 intake with a homebuilt pro form 750 holley double pumper, all this and a duraspark setup with one spring removed for quick advance, also i am gonna be runnin a set of coated flowtech headers, 1-3/4 primary, so what do yall think, its goin in a 72 short bed ford, i am up for any input on this combo, good and bad, thanks fellers
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From: Delaware
The torque is 422@2000 RPM and peaks at 449@3500 RPM, and drops off after 4000 RPM. The peak HP is 355@4500 RPM.
What do you plan to do with this truck. This cam provides peak torque at 3500 RPM, so it should be a good road cam with moderate gears.
You DCR is only 7.65:1 and should run on 91 Octane fuel.
What do you plan to do with this truck. This cam provides peak torque at 3500 RPM, so it should be a good road cam with moderate gears.
You DCR is only 7.65:1 and should run on 91 Octane fuel.
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From: conway arkansas
its just gonna be my daily driver, i was kinda hopin the torque would be a little more, i pretty much tried to build it as close as i coiuld to the one hot rod built back in 1998 or whenever it was, the cam they used i couldnt find in any catalog or on the website, but the one i got is real real close to whta they used, they said it made like 390hp and 460 ftlbs, this truck has 3.50 gears in it with a c-6, but anyhow, thanks for the input on it, like i say its good to have both positive and negative feedback on these sorta thing, my desktop dyno said though that it would make around 475ft lbs with a real flat torque curve, i know those damn things are just a guesstimation, but anyhow, thanks for all the input and i'm still tryin to figure out what yall keep talkin about on dynamic compression ratio, i figure its got somethin to do with cylinder pressure, dependant on cam timing, valve overlap and things,
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From: western montana
I really like the cam for those pistons and the 9.5 cr. With tims pistons i bet you will run 87 pump no problem...thats what everyone else runs with that dcr from report. (this is the 1st time I ?anything Danlee has ever said. and i wonder what the guru is thinking 
)
some would say not to use 060 blocks...i don't know- if heats an issue that could be it perhaps. the 750 carb would also be considered by many as overkill as you can't approach the rpm where it's needed or usefull. It will suck a bit more gas though.
also why studs vs pedestal? also what size valves, straight up timing, etc.
I'm still on my 1st 400 build and most of what i know is from others experience etc.
) some would say not to use 060 blocks...i don't know- if heats an issue that could be it perhaps. the 750 carb would also be considered by many as overkill as you can't approach the rpm where it's needed or usefull. It will suck a bit more gas though.
also why studs vs pedestal? also what size valves, straight up timing, etc.
I'm still on my 1st 400 build and most of what i know is from others experience etc.
Last edited by roger dowty; Feb 12, 2007 at 02:44 AM.
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From: conway arkansas
well mr.dowty, thanks for the input, i am gonna be runnin stock valves in the heads, as for the roller rocker thing, well i just happen to have gotten a good deal on the rockers off ebay, so thats the reasoning for them, plus it'll free up a little horsepower and keep the oil a little cooler, i dont figure 87 octane will be an issue, i mean worst i could have to do is run 34 degrees advance versus 36, you know, little things, the .060 part is because i bought thepistons before i got a block, so i figured well if it wont go .030 at least it oughta go .060, the carb is the one i had layin out in the shed off dads drag car, said i could use it if i bought a baseplate for it, so i did,
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From: Delaware
[QUOTE=roger dowty]I really like the cam for those pistons and the 9.5 cr. With tims pistons i bet you will run 87 pump no problem...thats what everyone else runs with that dcr from report. (this is the 1st time I ?anything Danlee has ever said. and i wonder what the guru is thinking )
QUOTE]
http://www.popularhotrodding.com/tec...eze/index.html
www.edyno.com
These sites say that you need 91 Octane or better for a DCR around 7.65:1, with a 180 degree Tstat. If you can find a 170 degree tstat for a 335 series motor, you could run lower octane fuel.
Remember that you have open chamber heads and no quench.
That cam is OK, but a dual patern cam with a longer exhaust duration will help at higher RPM. Then also you want to spread the lobe separation angle to keep the overlap reasonable. I used to run a Crane H278-2 dual pattern cam with 351C-4V heads and 10.2:1 static CR. That would run on 91 Octane if kept cool.
) QUOTE]
http://www.popularhotrodding.com/tec...eze/index.html
www.edyno.com
These sites say that you need 91 Octane or better for a DCR around 7.65:1, with a 180 degree Tstat. If you can find a 170 degree tstat for a 335 series motor, you could run lower octane fuel.
Remember that you have open chamber heads and no quench.
That cam is OK, but a dual patern cam with a longer exhaust duration will help at higher RPM. Then also you want to spread the lobe separation angle to keep the overlap reasonable. I used to run a Crane H278-2 dual pattern cam with 351C-4V heads and 10.2:1 static CR. That would run on 91 Octane if kept cool.
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From: western montana
doesn't Tim's pistons increase squish and therefor quench?
I really would like to get the details from folks who have built engines here cause there have been numerous badger/255deh builds that run on pump 87 and that dcr is closer to 7.75 if i remember. Tims engine ran on pump 87 too and I think it was closer to 8.
Lets run another thread on that and get some data. I agree with the dual pattern-
I really would like to get the details from folks who have built engines here cause there have been numerous badger/255deh builds that run on pump 87 and that dcr is closer to 7.75 if i remember. Tims engine ran on pump 87 too and I think it was closer to 8.
Lets run another thread on that and get some data. I agree with the dual pattern-
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From: Delaware
Originally Posted by roger dowty
doesn't Tim's pistons increase squish and therefor quench?
I really would like to get the details from folks who have built engines here cause there have been numerous badger/255deh builds that run on pump 87 and that dcr is closer to 7.75 if i remember. Tims engine ran on pump 87 too and I think it was closer to 8.
Lets run another thread on that and get some data. I agree with the dual pattern-
I really would like to get the details from folks who have built engines here cause there have been numerous badger/255deh builds that run on pump 87 and that dcr is closer to 7.75 if i remember. Tims engine ran on pump 87 too and I think it was closer to 8.
Lets run another thread on that and get some data. I agree with the dual pattern-
The data I am using was published in Popular Hot Rodding. It is an article by David Vizard, and I assume that he did the research to produce that data. I agree that it appears to be conservative, but I don't want to tell someone that he can run a high DCR and have him come back saying that the motor sounds like it has marbles in it. There are also other variables, such as alloy heads and fast burn chambers, and reduced timing advance that come into play. My current motor has a DCR of about 8.6:1, but with alloy heads and fast burn chambers, I expect to run on 93 Octane with no problem, and maybe mix in a little 89 Octane in a pinch.
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Mar 28, 2007 09:04 PM