[burg54]

My computer is having some issues accessing certain sites... so I was wondering if someone here could give me a guess-timate on my DCR and SCR? Here are the specs below. Thanks for your time!

Bore: 4.030
Stroke: 3.75
Head volume: 70cc (edelbrock 60739)
Head gasket bore: 4.100
Head gasket compressed thickness: .015
Deck clearance: .025
Rod length: 5.7
Piston volume: KB100-030 +7.00cc
Edelbrock 2201 cam
Operating Range1500-6500 RPM
Duration Advertised296° Intake/300° Exhaust
Duration @ .050''234° Intake/238° Exhaust
Lift @ Valve.539'' Intake/.548'' Exhaust
Lift @ Cam.359'' Intake/.365'' Exhaust
Lobe Separation Angle112°
Intake Centerline107°
Intake Timing @ .050" Open 10° BTDC
Close 44° ABDC
Exhaust Timing @ .050" Open 56° BBDC
Close 2° ATDC
Please let me know if you need any other info. Thanks!

 

[dreis454]

The piston is a major part of the equation.
I suggest you go on Summit Racing's site & find your piston and get the specs,as no one can even guess much less be accurate.

BTW if your cam is a Hydraulic roller, it looks like a small block version of my new one.

 

[burg54]

It is the hyd roller version. I have tried to find the pistons... will keep looking.

 

[dreis454]

It is the hyd roller version. I have tried to find the pistons... will keep looking.

Yes find those pistons and we can find your info pretty quick.

My cam is a Comp extreme marine custom grind for a BBC.

 

[burg54]

The pistons are KB100-030 +7.00cc
I updated the original post...

 

[dreis454]

I get 10.17 static & 7.97 DCR

I'm new to this static vs. dynamic thing but I have an active thread going on in the performance section titled "help me understand quench" good info there about how to correctly figure DCR.

AND....I stayed at a Holiday Inn express last night.

 

[burg54]

I get 10.17 static & 7.97 DCR

I'm new to this static vs. dynamic thing but I have an active thread going on in the performance section titled "help me understand quench" good info there about how to correctly figure DCR.

AND....I stayed at a Holiday Inn express last night.

haha... awesome! Thanks for the info! I will check out the other thread also.

 

[dreis454]

BTW, where did you find a .015" head gasket?

 

[GOSFAST]

BTW, where did you find a .015" head gasket?

Fel-Pro has the gaskets, 1094 is the part number I believe, .015" thick.

Thanks, Gary in N.Y.

P.S. I may be off base here, but the part numbers/dimensions for your platform don't appear correct. That #120 piston uses a 5.565" conn rod???

 

[burg54]

BTW, where did you find a .015" head gasket?

Fel-Pro has the gaskets, 1094 is the part number I believe, .015" thick.

Thanks, Gary in N.Y.

P.S. I may be off base here, but the part numbers/dimensions for your platform don't appear correct. That #120 piston uses a 5.565" conn rod???

My apologies... KB100-030. I was using the "compare" option and must have looked at the wrong part#. Still +7.00cc. Edit c/w. Yes, the gasket is the 1094 from Fel-Pro. Thanks for the heads up!:thumbsup: Ok, I have been all over this site trying to educate myself and work within my limits. Are the quench, SCR, and DCR within acceptable ranges for pump gas? Edelbrock tech gave me the thumbs up, but I like to hear from the other folks out there with experience. I should have some time this weekend to finish up the engine buildup and tranny swap. Hopefully, I can post some info from my experiences when it is all said and done. Thanks for all your help!

 

[Tom Mobley]

I get it 9.7:1 with the usual numbers, zero deck it's 10.1. Pretty good numbers if you want to actually drive it anywhere.

I wouldn't use that gasket with aluminum heads on an iron block. use the regular old Fel-Pro blue stripe teflon coated. 039 thick.

The real loser in this deal is that cam. It was obsolete 20 years ago, hasn't gotten better. It's totally pointless to chase around fractions of a CR point when running a cam like that. If you're going to stick with a non-roller and all that entails look at a modern grind like one of the Lunati. Sell the eddy cam to somebody who doesn't know any better and move up. Keep the Eddie lifters though, high quality. be sure you read up on initial fire-up best practices and acceptable oils for non-roller cams.

Be careful, those heads may have springs for hyd. roller cam. If so they'll wipe the lobes off your flat lifter cam in no time even if you get everything else right.

[edit] looks like Edelbrock calls out a non-roller compatible spring with that 60739 part number]

 

[sschevellefan]

I get it 9.7:1 with the usual numbers, zero deck it's 10.1. Pretty good numbers if you want to actually drive it anywhere.

I wouldn't use that gasket with aluminum heads on an iron block. use the regular old Fel-Pro blue stripe teflon coated. 039 thick.

The real loser in this deal is that cam. It was obsolete 20 years ago, hadn't gotten better. It's totally pointless to chase around fractions of a CR point when running a cam like that. If you're going to stick with a non-roller and all that entails look at a modern grind like one of the Lunati. Sell the eddy cam to somebody who doesn't know any better and move up. Keep the Eddie lifters though, high quality. be sure you read up on initial fire-up best practices and acceptable oils for non-roller cams.

Be careful, those heads may have springs for hyd. roller cam. If so they'll wipe the lobes off your flat lifter cam in no time even if you get everything else right.

Im pretty sure the grind he listed is the hydraulic roller performer rpm cam. Ill have to check on that number though. If it is then there is no worried=s for break in.

 

[Tom Mobley]

It is in fact the roller cam. You'll have to get the heads with the roller springs or change out the springs.

Still an obsolete grind though. lift is short for the long duration. sell it, look at the Lunati http://www.lunatipower.com/Product.aspx?id=1989&gid=289. It'll make way more power than the Eddie and use the same lifters and springs. roller springs, that is.

 

[GOSFAST]

Hi Matt, still an issue with the numbers. Using that corrected piston number with a non-milled block will not give a .025" deck height!

In order to have that D.H. you would need a block that measures 9.033", it's not going to happen??

You may have the C.H. figured at 1.420" while that piston use a 1.433", just guessing here!

Also, make sure you're not adding (+7 cc's) to the equation, it's actually a substracted number to make the correct C.R.

In any event, that cam will be able make 450+ HP (not sure about Edelbrock heads here) and you should be good on pump, but really need the accurate numbers.

(Tom) That 1094 gasket is fine with the platform he's building, aluminum heads, iron block. Will need good finished surfaces though!

(Add) I would make certain to have "dual" springs on the heads and some lightweight retainers if the budget allows.

Thanks, Gary in N.Y.

P.S. Just to add this, if you use the numbers/dimensions you posted, you will be around 10.2 static and 9.2 dynamic. I believe with all the "true" numbers you will be at 10.35 and 9.35 with non-milled decks and a deck hgt of .017".

 

[burg54]

Wow! That's what I love about this site!
Tom/Gary... thanks for the info! Yes, it is a roller cam. I checked with Edelbrock about the springs...here is what the tech quoted:
Valve Springs: Complete cylinder heads are assembled with valve
springs that are compatible with Edelbrock Performer, Performer
RPM and Performer RPM Hydraulic Roller camshafts. If any other
camshaft is used, check with the camshaft manufacturer for
recommended valve spring pressures.
Gary, I have measured the piston to deck height multiple times on all the cylinders. I am going to use a different tool from the shop and try again. What else could I be doing wrong to get that measurement? At .017, the gasket will be to thin for a good quench, right?

 

[burg54]

Ok...I took some micrometer readings with our digital guage we use on turbine engine combustion cans... I am still getting readings of .023-.025...
The math doesn't add up though. If you go off of (stroke/2)+rod length+piston compression=... you get 9.008 which in turn gives the .017 you are talking about. I think my best bet would be to go to a .020 gasket that will keep me between .037 to .045 for quench. Now, who makes that gasket???

 

[nashville beth]

At .017, the gasket will be to thin for a good quench, right?

Nope, that gasket should be perfect.

You want around .040" and you have .023" in the hole and .017" gasket = .040".

Do you work on gas turbines ? I work on steamers.

 

[wotr]

I get 10.17 static & 7.97 DCR

I'm new to this static vs. dynamic thing but I have an active thread going on in the performance section titled "help me understand quench" good info there about how to correctly figure DCR.

AND....I stayed at a Holiday Inn express last night.

His pistons are already in and he has measured .025 in the hole with a .015 gasket.
Your 10.174 is correct.
Your 7.97 is correct ,,, "if",,, edelbrock says the intake closes at 68* @ .006,, or lower,,, or if he degreed the cam in and set it at 68*,, but if neither of these,,,, then according to his 44* at .050,, and the advertised of 296,,

Static 10.174 - DCR 7.5 L J

 

[burg54]

Nope, that gasket should be perfect.

You want around .040" and you have .023" in the hole and .017" gasket = .040".

Do you work on gas turbines ? I work on steamers.

Air Force... used to work on ground equipment/support equipment...now I just manage people!!:boring:

 

[burg54]

His pistons are already in and he has measured .025 in the hole with a .015 gasket.
Your 10.174 is correct.
Your 7.97 is correct ,,, "if",,, edelbrock says the intake closes at 68* below .006,,, or if he degreed the cam in and set it at 68*,, but if neither of these,,,, then according to his 44* at .050,, and the advertised of 296,,

Static 10.174 - DCR 7.5 L J

I didn't degree the cam.