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EMC 289

General engine tech -- Drag Racing to Circle Track

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Steve.k
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Re: EMC 289

Post by Steve.k » Wed Oct 09, 2019 4:24 pm

Were you allowed any kind of spacer geoff?

Mummert
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Re: EMC 289

Post by Mummert » Wed Oct 09, 2019 7:09 pm

Spacers were allowed 8" total from lifter valley rails to top of spacers.

As far as cam timing goes the 289 is at the extreme of one end. Small packaging makes for short runners, and large bore allows for alot curtain area. A 1.9" valve in a 289 is equivalent area /in. to a 2.25 in a 427. So your peak flows will be relative per cu/in.. The one thing most people overlook is that the 289 will have about 25% more low lift flow relative to size.
Runner length and curtain area have influenced more of my cam descisions latley than flow numbers.
The cam your buddy chose may very well make a few more ponies at 7200rpm than mine, but I wouldn't expect anything to happen much below about 5000rpm.. If he was running smaller valves and a tunnel ram or something with longer runners he might not be far off.
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Steve.k
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Re: EMC 289

Post by Steve.k » Wed Oct 09, 2019 11:42 pm

Very impressive Geoff just the same. Good job you and all involved. The old technology continues to shine.

dondon
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Re: EMC 289

Post by dondon » Wed Oct 09, 2019 11:52 pm

I'd like too know what those 289 heads flowed when you were done with them,if you would be so kind.

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Re: EMC 289

Post by Mummert » Thu Oct 10, 2019 12:35 am

The heads flowed 235 cfm @600 and 190 exhaust@.600. These heads still have good port wall thickness. You could find a little more out of them but run the risk of having something unreliable.
You don't have put a ton of thought into it to realize that with 12.5 or 13.0:1 compression and a taste more camshaft and a single plane that you could start knocking on 500hp if you were willing to spin it 7600-7800rpm!
I know the hitters are already doing this but it just sounds cool to say it.
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GARY C
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Re: EMC 289

Post by GARY C » Thu Oct 10, 2019 1:08 am

Mummert wrote:
Wed Oct 09, 2019 12:20 pm
This is a bad pic but it shows or best score of 2513 at westech with weiand Xcellerator vs our best scoring run of 2520 at EMC with the Air Gap.
Pk hp Air Gap 446 xcellerator 451
Very cool build, any ideas on the strange dip between 5000 and 5600?
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Carnut1
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Re: EMC 289

Post by Carnut1 » Thu Oct 10, 2019 6:14 am

Mummert wrote:
Thu Oct 10, 2019 12:35 am
The heads flowed 235 cfm @600 and 190 exhaust@.600. These heads still have good port wall thickness. You could find a little more out of them but run the risk of having something unreliable.
You don't have put a ton of thought into it to realize that with 12.5 or 13.0:1 compression and a taste more camshaft and a single plane that you could start knocking on 500hp if you were willing to spin it 7600-7800rpm!
I know the hitters are already doing this but it just sounds cool to say it.
Those are real world flow numbers with serious work. I just want to see what this mill would do with a tunnel ram and dual fours. Love this build!
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ClassicComp
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Re: EMC 289

Post by ClassicComp » Thu Oct 10, 2019 6:52 am

Great job!!
What were your valvespring pressure set at ?
How much total timing and can you show a comb chamber pic if you have one?
Thanks
results speak for themselves
BobF

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Re: EMC 289

Post by Elroy » Thu Oct 10, 2019 10:46 am

Carnut1 wrote:
Thu Oct 10, 2019 6:14 am
Those are real world flow numbers with serious work. I just want to see what this mill would do with a tunnel ram and dual fours. Love this build!
Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D

hoffman900
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Re: EMC 289

Post by hoffman900 » Thu Oct 10, 2019 10:59 am

Bill-C,

How does this engine compare to the road race engines you build with these heads?
-Bob

Carnut1
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Re: EMC 289

Post by Carnut1 » Thu Oct 10, 2019 11:59 am

Elroy wrote:
Thu Oct 10, 2019 10:46 am
Carnut1 wrote:
Thu Oct 10, 2019 6:14 am
Those are real world flow numbers with serious work. I just want to see what this mill would do with a tunnel ram and dual fours. Love this build!
Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D
Elroy, if you had read my 289 head thread you would know that Bill C bailed me out and sent me one of his cnc heads after I made a sprinkler out of one. For doing me this huge favor he wanted a chunk ( In, ex ports) of the sprinkler head to see if he missed anything doing his cnc work. So IF Bill did any adjustment after looking at my work and incorporated it into his cnc program does that mean I had any part in Mummert's win? I think not but it made me feel good thinking of that possibility.
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cv67
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Re: EMC 289

Post by cv67 » Thu Oct 10, 2019 12:05 pm

xcelerator vs rpm...what was done to the rpm?
Just noticed the xcelerator is still sold whats your opinion of it for a hot st car in general?
How would it compare to a team G? Like older stuff.

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Re: EMC 289

Post by Elroy » Thu Oct 10, 2019 12:10 pm

Carnut1 wrote:
Thu Oct 10, 2019 11:59 am
Elroy wrote:
Thu Oct 10, 2019 10:46 am
Carnut1 wrote:
Thu Oct 10, 2019 6:14 am
Those are real world flow numbers with serious work. I just want to see what this mill would do with a tunnel ram and dual fours. Love this build!
Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D
Elroy, if you had read my 289 head thread you would know that Bill C bailed me out and sent me one of his cnc heads after I made a sprinkler out of one. For doing me this huge favor he wanted a chunk ( In, ex ports) of the sprinkler head to see if he missed anything doing his cnc work. So IF Bill did any adjustment after looking at my work and incorporated it into his cnc program does that mean I had any part in Mummert's win? I think not but it made me feel good thinking of that possibility.
I have glanced through that thread////just was thinking you may want to build an engine to test your flow work.//cool story and most likely a fairly dysfunctional sprinkler//// :oops:

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Re: EMC 289

Post by Carnut1 » Thu Oct 10, 2019 12:14 pm

Elroy wrote:
Thu Oct 10, 2019 12:10 pm
Carnut1 wrote:
Thu Oct 10, 2019 11:59 am
Elroy wrote:
Thu Oct 10, 2019 10:46 am

Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D
Elroy, if you had read my 289 head thread you would know that Bill C bailed me out and sent me one of his cnc heads after I made a sprinkler out of one. For doing me this huge favor he wanted a chunk ( In, ex ports) of the sprinkler head to see if he missed anything doing his cnc work. So IF Bill did any adjustment after looking at my work and incorporated it into his cnc program does that mean I had any part in Mummert's win? I think not but it made me feel good thinking of that possibility.
I have glanced through that thread////just was thinking you may want to build an engine to test your flow work.//cool story and most likely a fairly dysfunctional sprinkler//// :oops:
Those two sets of 289 heads are still at Terry Walters shop awaiting DV to dyno test them. Obviously not at the top of his to do list.
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Elroy
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Re: EMC 289

Post by Elroy » Thu Oct 10, 2019 12:22 pm

Carnut1 wrote:
Thu Oct 10, 2019 12:14 pm
Those two sets of 289 heads are still at Terry Walters shop awaiting DV to dyno test them. Obviously not at the top of his to do list.
You could/should test them yourself///that way you know////a 289 or 302 shortblock could be done for a reasonable amount I would think/////you could probably tool one up in your sleep///do you have a dyno local

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