Engine Masters - The Turbo MoHo 440

[273]

What I find interesting about this build is not the turbo part of the build but the NA @ 13:00 mins.

When they add TF 240 heads to a stock low cr ( low 7's cr) 440 with questionable ring seal and only a xe268h cam now the motor is making ok power obviously not super great especially for the heads. 433 hp @ 5300 rpm & 474 tq @ 4300 rpm not bad for a low 7 cr xe268h cammed engine obviously the heads are doing most the work but if you up the cr to something more reasonable power probably be up another 30-50 hp add a roller 224 cam and probably be in the 500's hp.

I just found what the xe268h did with this engine to be mildly impressive.

 

[PRH]

I come up with low-8’s for CR with the 78cc heads, pistons down .155 and .040 gaskets.

Just keeping everyone honest ;)

 

[GTX JOHN]

In the kind of racing that we do, the cylinder heads
are probably the most significant factor in horsepower.
Even with heads that are identical to the CCs in the runners,
the flow varies greatly.
Over the years I have sometimes struggled with short block
sealing issues (Think 10% leak down) and still run reasonably
competitively as long as the top end of the engine was near optimal.

Even in our street/strip cars (Think 10 second range stuff) the cylinder
heads we run are the keystone to their performance and where we spend
a lot of our money.

My .02 = For Free!



Flame Away!!

 

[273]

I see heads as the potential and the rest of the combo decide how much of that potential will be used, obviously that 440 not using much of the TF 240cc potential but a xe268h was able to squeeze 433 hp which I feel most wouldn't think of that cam as a 400+ hp cam.

 

[273]

Here's another motor home 440, 381 hp @ 4,900 rpm & 477 tq @ 3500 rpm with a 227 thumper cam air gap and headers. The second half of the video is the 383 mopar vs chev.

 

[junkyardhero]

not all that shocking.

i fired up the way back machine and here's one from @IQ52 with a full run down

Dyno testing a stock(?) 1972 440

We're doing a dyno exhibition for the locals on Saturday the 14th so they can see what an engine dyno is and what it may be useful for. We pulled a 440 engine from a 1978 New Yorker, that turned out to be a 1972 440, .040" over with 906 heads. Pistons are .160" down from the deck, so with the...

www.forabodiesonly.com

here's another that's a little more recent, similar numbers

Low compression 440 dyno test

I did this last winter and I thought some of you may find it interesting. I had a 77 440 highway patrol motor I ran the crap out of in the 90s. Last winter I took it apart to freshen it and swap the cam. I reused the bearings since the crank was reground in 1998 because I spun a rod bearing at...

www.forabodiesonly.com

repeat the mantra: the magic is in the heads.

 

[273]

not all that shocking.

i fired up the way back machine and here's one from @IQ52 with a full run down

http://[URL]https://www.forabodiesonly.com/mopar/threads/dyno-testing-a-stock-1972-440.249866/

[/URL]

here's another that's a little more recent, similar numbers

http://[URL]https://www.forabodiesonly.com/mopar/threads/low-compression-440-dyno-test.504716/

[/URL]

repeat the mantra: the magic is in the heads.

Agree, It does show even a xe268h cam can be a mid 400+ hp cam with great heads.

 

[MOPARMAGA]

It's very difficult for a 240 head to not make 600 HP on a decent built short block.
I have to say the 268 cam is one that makes me wanna puke, every build we do at the shop I work at seems to get it...needless to say, I need a new place to work lol .

 

[junkyardhero]

It's very difficult for a 240 head to not make 600 HP on a decent built short block.
I have to say the 268 cam is one that makes me wanna puke, every build we do at the shop I work at seems to get it...needless to say, I need a new place to work lol .

chalk it up to because that's what's getting the most press. it's the "safe" cam for most any build in that you're not leaving a lot on the table coming or going and it'll still have some semblance of streetability.

as far as an off the shelf cam, it's a fairly good choice for a wide range of motors and builds.

 

[273]

It's very difficult for a 240 head to not make 600 HP on a decent built short block.
I have to say the 268 cam is one that makes me wanna puke, every build we do at the shop I work at seems to get it...needless to say, I need a new place to work lol .

It's probably a popular choice to me it's right in between so call RV cams and what I'd call street strip cams generally where you really start trading bottom for top end.

 

[273]

chalk it up to because that's what's getting the most press. it's the "safe" cam for most any build in that you're not leaving a lot on the table coming or going and it'll still have some semblance of streetability.

as far as an off the shelf cam, it's a fairly good choice for a wide range of motors and builds.

Safe cam is a pretty good way to look at, From the dyno results I've seen going smaller doesn't really gain you anything and bigger generally start really moving the powerband up away from down low and make deeper gears and higher stall become more mandatory.

 

[Mean416]

Guys will spend a few hundred bucks on a big stick but don't want to drop $2500 on a good torque converter, gears, and locker. For those guys it's better to go safe.