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Iron Eagle 215 heads

 
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun Jan 01, 2012 7:53 pm    Post subject: Iron Eagle 215 heads Reply with quote

im considering buying a gen 1 sbc with the Iron Eagle 215 heads on it. its a fresh rebuilt motor and im planning on doing some more conversions to use it with my LT1 fuel injection in my Impala. the heads are supposed to have 72cc chambers and with the calculations i came up with (with the limited info i have), i get just under 10.5:1 compression. my concern is... will this be borderline too much compression with the iron heads in a daily driver ? the cam i plan to run is the Comp 268XFI.
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af2
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1933 Willys Coupe

PostPosted: Mon Jan 02, 2012 2:55 am    Post subject: Reply with quote

10.5:1 with 72 cc heads means you have a pretty good DOME on the piston.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Mon Jan 02, 2012 3:40 pm    Post subject: Reply with quote

I ran it through our calc and here's what I come up with for a 4cc dome piston with 0 deck height:

Code:
You Entered:
Bore 4.03 (inches)
Stroke 3.48 (inches)
Rod Length 5.7 (inches)
Cyl. Head Vol. 72 (cc)
Deck Height 0.00 (inches)
Head Gasket Bore 4.1 (inches)
Head Gasket Thickness 0.039 (inches)
Piston to Cyl. Wall Clearance 0.003 (inches)
Top Ring Land Height 0.25 (inches)
Piston Dome Vol. 4 (cc)

Compression Ratio:
10.51 : 1

Displacement:
355.1(ci), 5.8 (liters)


That cam has a 63 degree IVC which works out to be 8.501 : 1 DCR. For iron heads that might be a bit on the high side especially with dome pistons.

Are going with the regular Iron Eagle or the Platinum version?

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clay
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1972 Chevrolet Nova

PostPosted: Mon Jan 02, 2012 9:42 pm    Post subject: Reply with quote

What was the stock compression ratio on a LT1 Camaro? I was thinking it was around the mid 10's. It did have aluminum heads but I'm assuming it also has knock sensors that would help matters some. Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Mon Jan 02, 2012 10:31 pm    Post subject: Reply with quote

heads are old iron Eagles not the Platinum series. i searched the number stamped on the end of the heads and came up with this.... http://www.summitracing.com/parts/DRT-10620020

according to the machinist that built the motor, the pistons are two valve relief flat tops.

i dont really know the exact deck height or gasket thickness but i do know the gaskets are Fel-Pro. knowing the machinist, deck is close to, if not at, 0.

compression on a factory LT1 is right at 10.5:1.

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Big Dave
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PostPosted: Tue Jan 03, 2012 6:37 pm    Post subject: Reply with quote

But the LT-1 (LT-4) in late model Corvettes and Impalas was reverse cooled to reduce the temp around the spark plug and exhaust valve seat. The 1970-71 LT-1 370 horse 350 had access to one hundred octane gas available to keep it out of trouble. So I wouldn't compare them personally.

Big Dave
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Wed Jan 04, 2012 11:52 am    Post subject: Reply with quote

stock lt1 pistons and these heads will not get you to that comp ratio.....no way
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1979 Chevrolet Camaro

PostPosted: Wed Jan 04, 2012 1:49 pm    Post subject: Reply with quote

If you have a zero deck height, felpro 1094 head gasket, and flat top pistons with 4cc valve relief here's what I come up with:

Bore 4.03 (inches)
Stroke 3.48 (inches)
Rod Length 5.7 (inches)
Cyl. Head Vol. 72 (cc)
Deck Height 0 (inches)
Head Gasket Bore 4.1 (inches)
Head Gasket Thickness 0.015 (inches)
Piston to Cyl. Wall Clearance 0.003 (inches)
Top Ring Land Height 0.25 (inches)
Piston Dome Vol. -4 (cc)

Compression Ratio:
10.174 : 1

Displacement:
355.1(ci), 5.8 (liters)

IVC ( ABDC) - Dynamic Stroke (inches) - DCR
57 -----2.878 -----8.586 : 1
58 -----2.856 -----8.53 : 1
59 -----2.835 -----8.473 : 1
60 -----2.813 -----8.415 : 1
61 -----2.79 -----8.356 : 1
62 -----2.768 -----8.296 : 1
63 -----2.745 -----8.236 : 1
64 -----2.722 -----8.174 : 1
65 -----2.698 -----8.112 : 1
66 -----2.674 -----8.049 : 1
67 -----2.65 -----7.984 : 1
68 -----2.625 -----7.92 : 1
69 -----2.6 -----7.854 : 1
70 -----2.575 -----7.787 : 1

I would think it would work well if the numbers are correct.

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squeeezer
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PostPosted: Wed Jan 04, 2012 1:52 pm    Post subject: Reply with quote

add to that the fact it will not have a 0 deck and AT LEAST a -6cc v.r.
LUCKY TO HAVE 9.5 TO 1

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Jan 04, 2012 3:59 pm    Post subject: Reply with quote

it appears that i neglected to mention that its a 383 not a 350 Embarassed .

i wont be able to pull the heads off of it and verify pistons and deck height until saturday. right now im just going off of what i see and what is supposed to be in it.

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squeeezer
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1991 Chevrolet Camaro

PostPosted: Wed Jan 04, 2012 4:57 pm    Post subject: Reply with quote

You rascal
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1979 Chevrolet Camaro

PostPosted: Wed Jan 04, 2012 5:36 pm    Post subject: Reply with quote

Leaving everything else the same and changing the stroke to 3.75 the compression jumps to 10.885:1 and DCR to 8.847 : 1.
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Jan 05, 2012 12:20 am    Post subject: Reply with quote

its looking like its going to be more trouble than its worth to use this engine. by the time i change the cam, lifters, valve springs, pushrods, make the changes necessary to run my LT1 fuel injection, and buy the longblock, im better off just rebuilding the LT1.

although, if anyone wants those Iron Eagle heads or any other parts from this engine, i will see if the current owner will wise up and part it out since hes not going to use it.

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