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Re: Pro stock tech [Re: CMcAllister] #2477430
04/04/18 03:46 PM
04/04/18 03:46 PM
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Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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Alan Prusiensky  Offline OP
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Originally Posted By CMcAllister
I hear guys talk about the maintenance requirements for a good Top Sportsman combination. Can you gives us some insight on the maintenance routine at the PS level? Number of runs on a freshen, disassembly for inspection, piston/rod replacement, valve springs, etc?

Do you have one or two race day engines that are in a constant state of R&D or mule motors to do R&D on with that info being incorporated in the good engines?

Do you do your own chassis tuning or do you have "people"? Is there constant tweaking according to the track, gear ratios, etc., or is it once it's sorted, it's just a matter of shock adjustments, clutch adjustments, etc.?
the maintenance isn't as bad as you would think. As far as valve springs we can get 20 Dyno pulls on the intake Springs and 8 to 10 runs down the track. We take the motor apart as much as we can just because we're always trying to look at it as much as possible. The Pistons usually last around 50 passes and the rods last hundreds of passes.
I have two good engines one I like to run more than the other. But unfortunately last Friday dropped a valve on the dyno so I'll be running the backup engine for the next two races.
As far as the chassis this year I have taken that on as far as last year other people did help me. But I felt I needed to do everything myself to save cost as much as possible to race as long as I possibly could. I make all the gear selecting changes and calls myself and also I service the clutch in between each round.

Re: Pro stock tech [Re: Alan Prusiensky] #2477505
04/04/18 07:14 PM
04/04/18 07:14 PM
Joined: Jun 2003
Posts: 2,406
Weatherford, Texas
RapidusMaximus Offline
top fuel
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Weatherford, Texas
Originally Posted By Alan Prusiensky
Originally Posted By Alan Prusiensky
Originally Posted By moparmitch
Whats the bore and stroke of a typical pro stock engine?

Do you have a minimum bob weight you need to have?

Thanks for joining the forum!
my bore is 4.733 and my stroke is 3.55. I would like to try a 4.75 bore combo but my budget just isn't going let me.i think alot of teams run 4.75 bore motors.
I run steel rods so we aren't close to the min. Bob wt rule.

I'm a little shocked that you run steel rods...I would have thought aluminum would have free'd up a little hp...is this more of a longevity issue?


1968 Plymouth GTX
1974 Dodge P/U Long Bed Stepside 318
2019 Ram 2500 6.4, auto, 4WD
Re: Pro stock tech [Re: Alan Prusiensky] #2477508
04/04/18 07:18 PM
04/04/18 07:18 PM
Joined: Dec 2009
Posts: 275
brisbane,australia
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coletrickle Offline
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brisbane,australia
Allan you just keep doing what your doing!I have been a fan of Mopar Prostock "Underdog"racers and without doing a spread sheet id say after your last qualifying your as close to those other cars than everybody thats ever tried Matt Hartford etc.
If you can post a vid of any motor on the dyno you'll get a heap more followers,i had a vid of a B/D engine on the dyno in texas and it blew minds with the noise and revs and it was under 10,500 rpm😆and if i remember it was around the 1370hp mark and it was a 466inch iirc.Where can i get some t shirts and stickers?

Re: Pro stock tech [Re: RapidusMaximus] #2477520
04/04/18 07:33 PM
04/04/18 07:33 PM
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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WHITEDART Offline
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bean town ....Ca
[/quote]
I'm a little shocked that you run steel rods...I would have thought aluminum would have free'd up a little hp...is this more of a longevity issue? [/quote]
. You can get tolerances a lot closer with the steel rod.. whistling


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: Pro stock tech [Re: Alan Prusiensky] #2477537
04/04/18 08:09 PM
04/04/18 08:09 PM
Joined: Jan 2008
Posts: 2,363
Cotati, CA
Dave Hall Offline
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Cotati, CA
Is anyone re-thinking the bore/stroke combo to make power below the 10.5K limit? Do you shift at or near the limiter? Does it hit the limit in the lights?
I know I got limiter on the brain but it just seems as if all the development to this point was to rev the engine higher to make more power??? It also seems as if the current combo's are not optimized for max effort below 10.5K?
Thanks Alan! This is cool!

Re: Pro stock tech [Re: RapidusMaximus] #2477543
04/04/18 08:32 PM
04/04/18 08:32 PM
Joined: Jan 2003
Posts: 6,130
Melbourne , Australia
LA360 Offline
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Melbourne , Australia
Originally Posted By RapidusMaximus
Originally Posted By Alan Prusiensky
Originally Posted By Alan Prusiensky
Originally Posted By moparmitch
Whats the bore and stroke of a typical pro stock engine?

Do you have a minimum bob weight you need to have?

Thanks for joining the forum!
my bore is 4.733 and my stroke is 3.55. I would like to try a 4.75 bore combo but my budget just isn't going let me.i think alot of teams run 4.75 bore motors.
I run steel rods so we aren't close to the min. Bob wt rule.

I'm a little shocked that you run steel rods...I would have thought aluminum would have free'd up a little hp...is this more of a longevity issue?


They have been running steel rods for years now. They is an interesting topic on YellowBullet that Nick Ferri chimes in on quite often, it's in the Normally Aspirated engine section


Alan Jones
Re: Pro stock tech [Re: Alan Prusiensky] #2477551
04/04/18 08:47 PM
04/04/18 08:47 PM
Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
FastmOp Offline
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Hot Rod Ridge
Instead of stall speed I should have said launch RPM

Re: Pro stock tech [Re: coletrickle] #2477560
04/04/18 09:06 PM
04/04/18 09:06 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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Alan Prusiensky  Offline OP
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Joined: Mar 2018
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New Jersey
Originally Posted By coletrickle
Allan you just keep doing what your doing!I have been a fan of Mopar Prostock "Underdog"racers and without doing a spread sheet id say after your last qualifying your as close to those other cars than everybody thats ever tried Matt Hartford etc.
If you can post a vid of any motor on the dyno you'll get a heap more followers,i had a vid of a B/D engine on the dyno in texas and it blew minds with the noise and revs and it was under 10,500 rpm😆and if i remember it was around the 1370hp mark and it was a 466inch iirc.Where can i get some t shirts and stickers?
thanks for the kind words. https dyno pull ://m.facebook.com/story.php?story_fbid=10210979195216705&id=1258826168 that a link to a Dyno pull I hope that works
You can get my t-shirt from nitrofishracing.com

Last edited by Alan Prusiensky; 04/04/18 10:04 PM.
Re: Pro stock tech [Re: Dave Hall] #2477566
04/04/18 09:18 PM
04/04/18 09:18 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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Alan Prusiensky  Offline OP
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Joined: Mar 2018
Posts: 104
New Jersey
Originally Posted By Dave Hall
Is anyone re-thinking the bore/stroke combo to make power below the 10.5K limit? Do you shift at or near the limiter? Does it hit the limit in the lights?
I know I got limiter on the brain but it just seems as if all the development to this point was to rev the engine higher to make more power??? It also seems as if the current combo's are not optimized for max effort below 10.5K?
Thanks Alan! This is cool!
like i said before I think the best combo is 4.750 bore 3.52 stroke but I can't spend the money to find out unfortunately.
We shift at 10500 the limiter doesn't hit until 10575. That's ideal if I do my job. In Q4 in Gainesville I pulled it out at 10200 in 2 gear than I shifted 3 gear low two and that just killed the 330 number 2.776. you have to be perfect when you don't have big power.
We make peak hp at 10000 I think that is a good spot for me.

Re: Pro stock tech [Re: FastmOp] #2477569
04/04/18 09:20 PM
04/04/18 09:20 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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New Jersey
Originally Posted By FastmOp
Instead of stall speed I should have said launch RPM
we adjust that between 6600 to 7200 depending on the track condition. I like higher than lower because it helps the rt times

Re: Pro stock tech [Re: Alan Prusiensky] #2477581
04/04/18 09:43 PM
04/04/18 09:43 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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New Jersey
If someone can tell me how to upload a picture. I have a racepak run on my phone.

Re: Pro stock tech [Re: Alan Prusiensky] #2477584
04/04/18 09:46 PM
04/04/18 09:46 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline
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I would be interested to know valve sizes and some head flow numbers if you can. Thanks for posting Alan.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Pro stock tech [Re: Guitar Jones] #2477589
04/04/18 09:55 PM
04/04/18 09:55 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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New Jersey
Originally Posted By Guitar Jones
I would be interested to know valve sizes and some head flow numbers if you can. Thanks for posting Alan.
we have a 2.600 intake 1.880 exhaust. flow numbers don't matter. Port size is more important.

Re: Pro stock tech [Re: Alan Prusiensky] #2477592
04/04/18 09:59 PM
04/04/18 09:59 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
Originally Posted By Alan Prusiensky
Originally Posted By Guitar Jones
I would be interested to know valve sizes and some head flow numbers if you can. Thanks for posting Alan.
we have a 2.600 intake 1.880 exhaust. flow numbers don't matter. Port size is more important.


Interesting.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Pro stock tech [Re: Alan Prusiensky] #2477602
04/04/18 10:19 PM
04/04/18 10:19 PM
Joined: Jan 2008
Posts: 2,363
Cotati, CA
Dave Hall Offline
top fuel
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Cotati, CA
Pics...Full Reply Screen, file manager, upload has to be 2MB or less. Go get 'em in Vegas!

Re: Pro stock tech [Re: Dave Hall] #2477611
04/04/18 10:39 PM
04/04/18 10:39 PM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline
I Live Here
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Mt. Vernon, Ohio
Alan,
how big of a role does weather have on the fuel injection system as far as making between round changes or is that compensated for by the computer like or similar to regular automotive fuel injection systems.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: Pro stock tech [Re: dartman366] #2477626
04/04/18 11:08 PM
04/04/18 11:08 PM
Joined: Mar 2018
Posts: 104
New Jersey
A
Alan Prusiensky Offline OP
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New Jersey
We use a calculation off of the weather to make an adjustment to our map most of the time it's less than 1% adjustment round to round.

Re: Pro stock tech [Re: Alan Prusiensky] #2477641
04/04/18 11:29 PM
04/04/18 11:29 PM
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines Offline
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Syracuse,NY
Hi Alan,

Just saying hi,long time, no chat....lol

and the notes are interesting. I dont want to know the actual max HP numbers, but what is the spread between where you are at now, and how much more power you need to make a top 10 type run? Obviously MPH is the tell all, but seems your able to stay respectable with some other chassis/clutch/gearing changes etc. Reminds me of when Allen and team struggled with less, but stayed close with hard work and a little creativity.


RIP Monte Smith

Your work is a reflection of yourself, autograph it with quality.

WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
Re: Pro stock tech [Re: CompWedgeEngines] #2477651
04/04/18 11:40 PM
04/04/18 11:40 PM
Joined: Mar 2018
Posts: 104
New Jersey
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Alan Prusiensky Offline OP
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Alan Prusiensky  Offline OP
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Joined: Mar 2018
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New Jersey
Originally Posted By CompWedgeEngines
Hi Alan,

Just saying hi,long time, no chat....lol

and the notes are interesting. I dont want to know the actual max HP numbers, but what is the spread between where you are at now, and how much more power you need to make a top 10 type run? Obviously MPH is the tell all, but seems your able to stay respectable with some other chassis/clutch/gearing changes etc. Reminds me of when Allen and team struggled with less, but stayed close with hard work and a little creativity.
I need probably 20-25 more. but I think I can run less than 1 mph off the fastest car with what I got now.

Re: Pro stock tech [Re: Alan Prusiensky] #2477672
04/05/18 12:29 AM
04/05/18 12:29 AM
Joined: Jan 2003
Posts: 2,150
Fancy Farm Ky
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wyoming Offline
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Fancy Farm Ky
Its good to see a Mopar still out there competing, ProStock has always been my favorite class. How is the parts situation? I'm ordering a shirt or two, thanks for the post, and hope luck goes your way, Thanks Glenn

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