Ok is this going to be a problem child ?

Posted By: VernMotor

Ok is this going to be a problem child ? - 04/19/14 10:29 PM

What I got with the combo I have is 14.5 compression. stock block-494ci eddy/mopar heads 72.4cc

Diamond pistons 4.355 bore 14cc domes .015 in the hole
4.15 stroke eagle crank-6.760 eagle rods-going to use fel-pro 1105 gaskets .051 thick. does have billet steel main caps. no fill. Tell me what you think ? Thanks Jamie

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/19/14 10:48 PM

Forgot E-85 fuel

Posted By: MR_P_BODY

Re: Ok is this going to be a problem child ? - 04/19/14 11:47 PM

Jamie... whats your cranking pressure... but I dont
see any issue with the E-85

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/19/14 11:49 PM

I don't know yet mike. it is not all together. do you think it would live with that much compression ?

Posted By: MR_P_BODY

Re: Ok is this going to be a problem child ? - 04/19/14 11:56 PM

Quote:

I don't know yet mike. it is not all together. do you think it would live with that much compression ?

Its all dependent on your cam.. when the intake closes
but I'm at 14.1:1 and not problem at all

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 12:05 AM

Ok how about you or anyone else recheck my math and see if you come up with the same numbers.
I have not bought a cam yet .So I should be looking for what ? one that would kill some of the cranking compression ?

Posted By: MR_P_BODY

Re: Ok is this going to be a problem child ? - 04/20/14 12:36 AM

As you know the larger the duration the lower the
pressure will be... what do you intend the rpm to be

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 12:55 AM

was shifting the car at 6000 and thought the traps at 6200

Posted By: MR_P_BODY

Re: Ok is this going to be a problem child ? - 04/20/14 01:15 AM

Quote:

was shifting the car at 6000 and thought the traps at 6200

I will assume this engine is gonna make more power
than the last one.. if so you will most likely go a
bit higher in the revs.... so what kind of duration
are you thinking

Posted By: 340RICK

Re: Ok is this going to be a problem child ? - 04/20/14 01:21 AM

Quote:

was shifting the car at 6000 and thought the traps at 6200

Jamie

I am guessing you will be shifting at 6800 and running low 10's now

Posted By: Dunnuck Racing

Re: Ok is this going to be a problem child ? - 04/20/14 01:26 AM

Quote:

Quote:

was shifting the car at 6000 and thought the traps at 6200

I will assume this engine is gonna make more power
than the last one.. if so you will most likely go a
bit higher in the revs.... so what kind of duration
are you thinking

277 @ .050 would work, hint, hint.
Keith

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 02:03 AM

Ok lol I do not ! will not run it that hard. 10.90 is just fine .in fact I thought I would shift this lower..be easy on it .live awhile

Posted By: Thumperdart

Re: Ok is this going to be a problem child ? - 04/20/14 02:18 AM

Quote:

Ok lol I do not ! will not run it that hard. 10.90 is just fine .in fact I thought I would shift this lower..be easy on it .live awhile

If that`s the case then why the high comp. Seems a waste to go 10.90............you can do that w/a basic 440 build.

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 02:23 AM

I did't mean for this to happen. I got a good deal on this short block. so I bought it. He told me it had 12.5 to 1 with his 75cc heads. LOL wrong ! and it had small domes on it. so now I am try to do the best I can with what I got.

Posted By: dogdays

Re: Ok is this going to be a problem child ? - 04/20/14 02:24 AM

How about because it's easier to make power with compression, and E85 supports some pretty high compression ratios.

R

Posted By: MR_P_BODY

Re: Ok is this going to be a problem child ? - 04/20/14 02:56 AM

Quote:

Ok lol I do not ! will not run it that hard. 10.90 is just fine .in fact I thought I would shift this lower..be easy on it .live awhile

You wouldnt be running it much harder than your old
engine... a few revs wont hurt that(not unless its
got stock rods)... but if you have aftermarket decent
rods then I wouldnt worry at all even if you went to
6800.... hell Jamie... you sound like you want to
idle to the finish line... LOL

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 03:30 AM

shift at 2500 and coast across the line LOL

Posted By: BradH

Re: Ok is this going to be a problem child ? - 04/20/14 03:33 AM

You have that high compression AND too much quench (.065"). How much CR can E85 support?

Posted By: Cab_Burge

Re: Ok is this going to be a problem child ? - 04/20/14 03:41 AM

You have two choices, use it or not use it

I would make sure it was alittle on the rich side with the E85 and not to much timing and go bracket racing

Who did or who is going to do your E85 Carb? I had AJ Castilini(SP?) do mine, it is real sensitive on the dyno to jetting, one jet size either way would make it lose power

BTW, E85 and bracket racing are made foe each other, hardly any change in ET from early morning to late afternoon

Don't tell anyone else that though

AKA I would worry about te main webbing on any stock 440 block if you decide to RPM it much above 7000 RPM on the edge on the tune up

Run it slightly fat and don't push the total timing and you should be okay

Posted By: gearhead01

Re: Ok is this going to be a problem child ? - 04/20/14 04:28 AM

Quote:

Ok how about you or anyone else recheck my math and see if you come up with the same numbers.
I have not bought a cam yet .So I should be looking for what ? one that would kill some of the cranking compression ?

I get the same 14.54:1 compression ratio.

John

Posted By: Thumperdart

Re: Ok is this going to be a problem child ? - 04/20/14 04:29 AM

Quote:

How about because it's easier to make power with compression, and E85 supports some pretty high compression ratios.

R

To go 10.90`s? Ya, that makes sense..............

Posted By: viperblue72

Re: Ok is this going to be a problem child ? - 04/20/14 04:41 AM

Quote:

I did't mean for this to happen. I got a good deal on this short block. so I bought it. He told me it had 12.5 to 1 with his 75cc heads. LOL wrong ! and it had small domes on it. so now I am try to do the best I can with what I got.

Your thinking is correct, that if you optimize this combination you will likely be over the limit of a stock block unless you go easy. But going easy is tough to do when you want to see what it can do.
Why not take the domes off and rebalance?

Posted By: deaks

Re: Ok is this going to be a problem child ? - 04/20/14 10:33 AM

Why not put a bigger cam in it, back the timing out a little and rev it to maybe 63-400. That way you're within your comfort zone but will still probably run mid 10's. I shift my .590 at around 6300 with nearly 13.1 comp, trap at 6700 and it's pulling like a train.
Mick

Posted By: dennismopar73

Re: Ok is this going to be a problem child ? - 04/20/14 12:28 PM

It will he fine, stock blocks have no issues till.you get over a magical 512 number in full race mode,
I run stock rods shift 6500 cross the line at 6800.
A 494 (500)) ci will have no issues , in fact should be a great build
Far as camshaft goes you have to ask is it race or street ,or combo.
Really not much difference, .
I'm not a large centerline guy never want to see a 110 or above stuff
That kills low end , a 494 will be have a ton of tq so why build something that requires rpm ?

Posted By: VernMotor

Re: Ok is this going to be a problem child ? - 04/20/14 03:10 PM

Cab I been running e-85 for years now. so same carb. This a Bracket race only. going to put a UD640 lift cam in it. at 102 and baby it LOL

Posted By: MRMOPAR622

Re: Ok is this going to be a problem child ? - 04/20/14 05:28 PM

The CR is not to high,and its perfect to run E85 and even better to run alcohol.I think you would like the alcohol better than the E85 and it would make a lot more torque,more torque=more power/speed with out having to raise the RPM level.