[RAIV-Z]

Raven Winter Update #2

3/16th partial steel midplate replaced with ¼ aluminum full plate Hall's Custom
Done
Performance Torque Converters torque converter checked out and tightened up.
Done
Innovators West, Inc. damper internals checked out and larger hub machined and double keyed
Done
BOP Performance belt drive upgraded to a GEN-IV (Previous was a GEN-III)
Acquired
DEI Header wrap being replaced with Summit Volcano Wrap
Acquired
Fuel Injector Development 275lb injectors cleaned and reflowed
Done
ARP Automotive main studs being replaced with a new set.
In-transit
Crower Cams & Equipment Co .Crower Billet 4.5 being replaced with a 4.25
Acquired Moldex 4.25
ATI flexplate being replaced with a Meziere
Acquired
Composite distributor gear swapped out for a bronze Brian Hedrick
Acquired
Cam shaft will be replaced
Acquired

Next up….
Pistons/Rings and potentially rods will be replaced
4.360 pistons
Aluminum rods
Wastegates dumps relocated so we won’t melt the spoiler(s) again

[Scott Stoneburg]

Why did you switch to a shorter stroke? For durability or will it make more power with the shorter stroke?

[RAIV-Z]

Originally Posted by Scott Stoneburg

Why did you switch to a shorter stroke? For durability or will it make more power with the shorter stroke?

Less stress on internal parts, with more RPM. I don't think we were at the limit of power with the 4.5 stroke yet, but we were out of RPM. The majority of current big power power boosted Pontiac are in the 480 to 500cid range.

[GTOGEORGE]

Originally Posted by RAIV-Z

Less stress on internal parts, with more RPM. I don't think we were at the limit of power with the 4.5 stroke yet, but we were out of RPM. The majority of current big power power boosted Pontiac are in the 480 to 500cid range.

Be a leader not a follower!



GTO George

[Stan Weiss]

Originally Posted by GTOGEORGE

Be a leader not a follower!



GTO George

What stroke is in Tommy Youmans engine?

Stan

[RAIV-Z]

Originally Posted by GTOGEORGE

Be a leader not a follower!



GTO George

I'm trying George, but it's not cost effective to reinvent the wheel. We will all go faster if we learn from one and other.

[slowbird]

Originally Posted by GTOGEORGE

Be a leader not a follower!



GTO George

Says the guy with a roots blower and carbs. Leading edge tech for 1940

[mgarblik]

Huge number of changes/up-dates in one off season. Love to see all that work being done to go faster and be more reliable. Dedication right there. I personally like the 482-500 Cu In. package better than the longer stroke, but allot of expense to make the change. What RPM's were you turning with the 4.5" arm? Any issues, or just a cautious change to push it harder in the future? When we ran the Grocery Getter with the 4.5" stroke, we felt we needed the extra cubes to get that very heavy car moving. You are probably 400 lbs. lighter than we were. Best of luck this year.

[RAIV-Z]

Originally Posted by mgarblik

Huge number of changes/up-dates in one off season. Love to see all that work being done to go faster and be more reliable. Dedication right there. I personally like the 482-500 Cu In. package better than the longer stroke, but allot of expense to make the change. What RPM's were you turning with the 4.5" arm? Any issues, or just a cautious change to push it harder in the future? When we ran the Grocery Getter with the 4.5" stroke, we felt we needed the extra cubes to get that very heavy car moving. You are probably 400 lbs. lighter than we were. Best of luck this year.

Thanks Mike,

Yeah, some updates were due to broken/worn parts, the main driver for changing the crank at this time was the need for pistons. To clean up a few of the bores we needed to go 0.010. The shorter stroke and aluminum rods will give us additional RPM head room as well as reliability. There were no major issues with the engine aside from the cracked damper hub and some signs of cracking on the cam key way. We're also replacing the keepers and retainers based on Victory's assessment of the valve train, they indicated we had few retainers where the taper was opening up. We did drop an intake valve last July. Victory suggested their Ti-17 retainers and associated keepers. The valves are also being lightened and we're performing a valve job.

We were keeping the rpm under 8000 with the 4.5 stroke. Did the Grocery Getter weigh over 4000lbs?

[[email protected]]

How high do you spin it?

[cgeise]

I was running over 8k with 4.5 crank -- just fyi

[RAIV-Z]

Originally Posted by cgeise

I was running over 8k with 4.5 crank -- just fyi

Soft rev limit was 7800, hard 7950. Heavy billet counterweighted crank and steel rods.

[[email protected]]

George how how do you twist yours up?

[GTOGEORGE]

Not very......I’ve had it 7,200 rpm but with my fuel situation anything over 6,800 is a waste. I wonder the stroke of those 900+ cubed No Prep and Pro Mod engines!


GTO George

[Stan Weiss]

Latest NKRA rule book I have is 2017. The supercharged and turbocharged Pro Mod engine have a max size of 526 ci Turbocharged and supercharged entries are limited to a maximum bore center of 4.800.

Stan

[RAIV-Z]

Originally Posted by Stan Weiss

Latest NKRA rule book I have is 2017. The supercharged and turbocharged Pro Mod engine have a max size of 526 ci Turbocharged and supercharged entries are limited to a maximum bore center of 4.800.

Stan

Another good point regarding engine size. Not that the Raven is a ProMod

[cgeise]

just an FYI the guy that helped us tune our deal -- one of the best around at the time really liked the longer stroke easier to build boost he said -- BBC 632s run all day at 8k with a 4.75 stroke crank -- so --- go for it

[RAIV-Z]

3/16th partial steel midplate replaced with ¼ aluminum full plate Hall's Custom
Done
Performance Torque Converters torque converter checked out and tightened up.
Done
Innovators West, Inc. damper internals checked out and larger hub machined and double keyed
Done
BOP Performance belt drive upgraded to a GEN-IV (Previous was a GEN-III)
Acquired
DEI Header wrap being replaced with Summit Volcano Wrap
Acquired
Fuel Injector Development 275lb injectors cleaned and reflowed
Done
ARP Automotive main studs being replaced with a new set.
Acquired
Crower Cams & Equipment Co .Crower Billet 4.5 being replaced with a 4.25
Acquired Moldex 4.25
ATI flexplate being replaced with a Meziere
Acquired
Composite distributor gear swapped out for a bronze Brian Hedrick
Acquired
Cam shaft replaced with one with a few degrees more duration.
Acquired
Ross Pistons Pins and Total Seal Rings
Acquired
Intake valve size increased from 2.270 to 2.280, Exhaust valves replaced
BME 396 Aluminum Rods
Acquired
Wastegates dumps relocated
Complete
ARP200 Head Studs
Acquired
DCI RAV Heads and intake being massaged by Jim Robertson.

Next up balancing and finish machine work on the short block.

[GTOGEORGE]

Originally Posted by RAIV-Z

DCI RAV Heads and intake being massaged by Jim Robertson.

Next up balancing and finish machine work on the short block.

What about DCI, I'm sure Don knows his heads better then anyone else?


GTO George

[slowbird]

Good update, any idea when you hope to be running again?