Benchrace This

[64falconsix]

while the Tri-power 200 is still just getting broke in I am thinking of It's future replacement or modification in search of more power without going to a v8. I am thimking of either an aluminum head and a 50 or 75 shot of n2o or a 250 with the same. with the comp 260 I run now I seem to have strong broad torque curve from 1800 to 4800 plus rpm. I will contiune to run an auto trans either a c4 or AOD with a stock converter and about 3.20 gear with the c4 or 3.55 with the AOD. this is just a weekend car but from time to time drive 50 or 100 mile to shows. I like to keep the highway rpms below 3000 which means around 60 MPH or so. If I built a 250 with the CI aluminum head and 9.5 to 1 compression what would be a good cam choice? I want something simalar to how the 200 runs with a lot of mid range torque and power that will pull hard from say 1800 to 5000 rpm. what would the power potential of this combo be? and lastley with cast pistons would a 50 or 75 N2O shot be to much or should I look at going with forged slugs.

 

[rbohm]

while the Tri-power 200 is still just getting broke in I am thinking of It's future replacement or modification in search of more power without going to a v8. I am thimking of either an aluminum head and a 50 or 75 shot of n2o or a 250 with the same. with the comp 260 I run now I seem to have strong broad torque curve from 1800 to 4800 plus rpm. I will contiune to run an auto trans either a c4 or AOD with a stock converter and about 3.20 gear with the c4 or 3.55 with the AOD. this is just a weekend car but from time to time drive 50 or 100 mile to shows. I like to keep the highway rpms below 3000 which means around 60 MPH or so. If I built a 250 with the CI aluminum head and 9.5 to 1 compression what would be a good cam choice? I want something simalar to how the 200 runs with a lot of mid range torque and power that will pull hard from say 1800 to 5000 rpm. what would the power potential of this combo be? and lastley with cast pistons would a 50 or 75 N2O shot be to much or should I look at going with forged slugs.

8) with the aluminum head and an AOD, i would step up to a 3.73 rear gear. with the overdrive that will still put you under 3000rpm at around 65, depending on what tire you will run.

as for the cam selection, pick one that works in the 1500-5000 rpm range, though with the 3.73 gears you can fudge that up about 500 rpm if you like without problems. as for running cast pistons with nitrous, i dont like doing that as if you get the mixture wrong under load, or you the engine goes lean for what ever reason, you will burn a piston very quickly with cast pistons, and possible even break one or two if the detonation gets bad. forged pistons are much better with chemical supercharging as they are much stronger and can handle the load longer, though even they will break if you run the engine lean for too long.

as for the converter, step up to one that has about 500 rpm more stall speed than stock for good street drivability, and still have a better launch when you stand on the gas.

 

[Anlushac11]

No offense intended but I have no intention of building another US inline six. It has taken me a couple of years but my 200 is almost done.

My next inline will be from Australia and have a Ford emblem and contain at least one over head cam.

With a auto trans I would keep duration under 270 deg and keep lobe center around 112.

If you have the aluminum head cam lift is only limited by piston to valve clearance since the CI keeps flowing, and flowing, and flowing even with high valve lifts.

 

[64 200 ranchero]

i would get a barra 4.0 dohc turbo with a six speed

 

[64falconsix]

Thanks for the responses. A slightly looser converter in an AOD and 3.73 sounds like it would work best. What do you think of the 264 / 274 110 cam. As for the Australian six I am trying to stay old school. No overhead cams or ECMs. Thanks for the suggestions though. I would just like to have a little more power. The tri power is putting out around 160 HP or so .I was hopeing an aluminum headed 250 might put me in the 250hp range with a shot of N2O for an extra boost when needed.

 

[rbohm]

Thanks for the responses. A slightly looser converter in an AOD and 3.73 sounds like it would work best. What do you think of the 264 / 274 110 cam. As for the Australian six I am trying to stay old school. No overhead cams or ECMs. Thanks for the suggestions though. I would just like to have a little more power. The tri power is putting out around 160 HP or so .I was hopeing an aluminum headed 250 might put me in the 250hp range with a shot of N2O for an extra boost when needed.

8) the cam you are asking about is a good cam for a street driven 250.

 

[FalconSedanDelivery]

Your a bit optimistic on your current hp rating ,its more like 125 but , as for the 250 combo , its a much better deal than any 200 ( 50 cubes are tough to beat ) the Cam is a good pick , BUT , only if you get a higher stall converter , its the total package , NOT just the engine parts that make a Fun combo , The great thing about a 250 ( along with the cubes ) is the fact that its a V-8 Pattern , so getting a converter is much easier and cheaper than with any of the others 144-200.

 

[MPGmustang]

A 264/274 is great for a MILD daily 200, as u have a 250 I highly recommend more cam, say 284/294 112, with a CR of 9.5, good for 91 octane. This cam will take advantage of the 50 extra cubes u got. Ur tri Carb setup should be able to reach 200hp with this type cam easily, BUT tune it with an oxygen sensor, you need it to get the correct af ratio as u don't want any detonation on any part of acceleration or cruise u'd rather be rich than too lean anyways.

 

[MustangSix]

The cam you now have works very well in a 250. I ran the same one in a log headed 250 with an AOD for years and it was a great daily driver with plenty of torque. I think you'd be surprised at how much extra grunt a 250 has over a 200.

The AOD is a good choice and an easy install behind a 250. Add a shift kit, but keep the lockup. With 3.55 gears your cruising rpm at 70 mph will be around 2000-2100 depending on tire diameter.