289ci Piston Choice - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
Reply
 
LinkBack Thread Tools
post #16 of 21 (permalink) Old 05-23-2019, 06:03 AM
Registered User
 
Join Date: Apr 2001
Location: Central West Virginia
Posts: 7,357
Re: 289ci Piston Choice

Quote:
Originally Posted by GT350HR View Post
n2omike
Post #9 near the end mentioned the idea of a 392 stroker and is the reason I went "off topic".

Further off topic , what does you 306 run on "motor only" . I am only curious as to how much you pick up with the spray as I am contemplating it. Randy
Well, the engine is kind of unique compared to what most people do. All the parts were sourced around 1995, just before all the cheap Chinese Stroker stuff started coming out, so it's still 306ci. It uses an old 1970 0.030"/0.040" Boss 302 steel crank and rods. It's built to be a STREET car, so it has a pump gas compression ratio and a solid flat tappet cam. (SFT were cheap, reliable and would rpm easily)

The cam/compression/gearing, etc are geared toward nitrous... so it's designed to be optimized for the bottle, which is an old Top Gun plate from the early 90's jetted for 200hp. A guy from Top Gun is who broke away to form Nitrous Express. I had the same kit on an old 289 headed engine jetted for 150 hp. After the engine was getting well worn, the nitrous was stepped up to 200 hp to compensate for wear, and has been there ever since. lol The current engine has been on 200 hp worth of the drugs from the beginning... which is around a dozen or so years, now. It was taken out for a freshen-up a few years ago, and showed no real signs of strain. Both engines have digested dozens of nitrous bottles without issue. The key to not killing them, is to not get greedy, and be conservative. A 'soft' tune can go a long way in regards to service life.

As for how they run off the bottle... I don't get to go to the dragstrip that often, so when I do I like to make the best of it! That means, I want to go as fast as possible, so pretty much every run is ON the bottle. With the drugs, the driver's seat is a BUSY environment! The 1/8 mile goes by in 6.29 seconds, and you're already in 4th gear before reaching the finish line. There's no time to think... It just has to be driven by instinct. OFF the bottle, it feels like everything is moving in slow motion, and I sometimes tend to shift too early. It's just not nearly as much fun, so almost every pass is a bottled one. lol

Most tracks around here are 1/8 mile. Going to a 1/4 mile track is a rare treat. The old engine was a 306 with 289 heads I ported. The best 1/8 mile times it produced were 6.73 @ 103 on the bottle, and 7.48 @ 93 naturally aspirated. For the naturally aspirated runs, a buddy with a 400 Camaro and I were really close performance wise off the bottle. (his car didn't have nitrous) so we kept making runs, and kept upping each other's best times! It kept going back and forth until I was launching my car wide open on the rev limiter at 7200 rpm! Shift point was only 6800. lol Since it was set up for the bottle, it would launch as hard as you wanted to off the bottle. Was a fun night. lol

I've only made ONE run with the current engine naturally aspirated. lol It was a warm day on a 1/4 mile track and ran 7.44 in the 1/8 and 11.66 in the 1/4. I'm sure it would do better, but with only getting to the track a couple times per year, I've always got the bottle turned on... as it's just a lot more fun and exciting. lol

The bottle is activated via a throttle switch. When the throttle is wide open, the nitrous is ON. The car is launched at 3/4 throttle. You just 'barely' lead with the clutch before going WOT, as you don't want the nitrous to come on before the clutch is released... or it tends to get violent. lol But, as soon as the clutch it starting to grab, the nitrous is on. It's all done by feel and just timing your feet. The bottle adds a MASSIVE amount of torque for launch, and improves that little 306's 60ft tremendously. The nitrous can also be switched to 'button' mode, so it's activated via a button on the shifter. This was used mostly in the street racing days, and for testing/playing around on the street. lol

I'm 51 years old, and have had the car since age 15, when it was bought as a beater first car for $1,300. We've been through a lot! lol

Well, that was a lot of rambling... Sorry for making you read all that, just to answer a simple question.
n2omike is offline  
Sponsored Links
Advertisement
 
post #17 of 21 (permalink) Old 05-23-2019, 11:39 AM
Registered User
 
Join Date: Aug 2015
Location: Anaheim CA
Posts: 454
Re: 289ci Piston Choice

All good thanks Mike .
I have raced my '66 Shelby continuously for the last 45 years. The current 331 has run 7.04 and 11.13 respectively. This is with a C4. I think my "old school" Ford dual four intake is holding me back fro a 6.9-10.9 et slip. I have a Vic Jr and if I had the ambition , (I'm 66) I would change it. My goal is to get a 9 second time slip on motor only and to do that I am building a 374ci all aluminum Boss 302 stroker. After seeing you pick up over a second with spray , I may rethink finishing the big engine. There are some videos of my car on you tube . It's a white '66 GT350H.
Randy

Experimental Ford parts collector.
GT350HR is offline  
post #18 of 21 (permalink) Old 05-23-2019, 04:43 PM
Registered User
 
Join Date: Apr 2001
Location: Central West Virginia
Posts: 7,357
Re: 289ci Piston Choice

Quote:
Originally Posted by GT350HR View Post
All good thanks Mike .
I have raced my '66 Shelby continuously for the last 45 years. The current 331 has run 7.04 and 11.13 respectively. This is with a C4. I think my "old school" Ford dual four intake is holding me back fro a 6.9-10.9 et slip. I have a Vic Jr and if I had the ambition , (I'm 66) I would change it. My goal is to get a 9 second time slip on motor only and to do that I am building a 374ci all aluminum Boss 302 stroker. After seeing you pick up over a second with spray , I may rethink finishing the big engine. There are some videos of my car on you tube . It's a white '66 GT350H.
Randy
That intake is DEFINITELY holding it back! A Victor Jr would likely put you right where you need to be! Sure would be nice to dip into the 6's and 10's with the current engine! Once you do that, then it could be retired, and you could go to work on the Big Engine!

Do NOT give up on that cool Boss 374! Try not to get too worried about numbers. It will be what it will be! Just go out there and optimize the car once you get the engine installed, and enjoy it! I have a feeling it will run GOOD!

Most cars don't pick up as much as mine on the bottle... especially considering it's 'only' a 200 hp plate. If you do go that route, you'll want to get with someone who really knows what they are doing... If you are using a factory block, it's even more important, as those can be the weak spot. A person has to take ALL precautions to avoid detonation... as THAT is what will kill a block that is at or near its limits.

On mine...
The compression ratio is well into the 'safe' zone.
Cold Race Plugs.
Not greedy with the timing.
I run it lean, but not excessively lean. (lean makes power!)
Better fuel than you think you'll need.
ONLY run the engine with a COOL engine temp! Warm engines are more likely to detonate.
Mine is a stock stroke, which puts less leverage on the block, and allows more power to be run through it.

I have an electric fan and water pump. Between runs, I hook it to the battery charger and cool the engine down to where it feels cool to the touch... then run it as little as possible up to the lanes for the next pass. Doesn't take long at all with BOTH the fan AND water pump.

For now, PUT A VICTOR JR ON IT!!! It will be fun to see what kind of a difference it might make!

Good Luck!
n2omike is offline  
 
post #19 of 21 (permalink) Old 05-24-2019, 10:16 AM
Registered User
 
Join Date: Aug 2015
Location: Anaheim CA
Posts: 454
Re: 289ci Piston Choice

Thanks Mike ,
The manifold swap is on the "to do" list. The dual fours look cool and do make power , but there is no doubt the Vic Jr ( especially my "worked" version) will make more power. I have so many runs as it is that any change will show up no matter what time of year or track conditions. Once in the tens , I will finish the 374 and set the 9 second goal in place. As in yours a 200 hp increase "should do it'', and the 374 has that capability. Thanks .
Randy

Experimental Ford parts collector.
GT350HR is offline  
post #20 of 21 (permalink) Old 05-27-2019, 08:08 PM Thread Starter
Registered User
 
Join Date: Nov 2018
Posts: 22
Re: 289ci Piston Choice

Well, took to the 351w apart today. It's decent, better than the 289 I was going to rebuild by a long shot lol.

Last edited by 29EssexRat; 05-29-2019 at 01:04 PM.
29EssexRat is offline  
post #21 of 21 (permalink) Old 06-10-2019, 03:09 PM
Registered User
 
Join Date: Sep 2001
Location: Anaheim Hills, Ca
Posts: 1,477
Re: 289ci Piston Choice

If you're concerned about 289 piston weight, use a longer rod. You could use a stroker rod such as a 5.4" or 5.315" and a piston with shorter compression height and lighter weight. You may have to use a Chevy piston and bore the rod small end to piston pin. Used to happen all the time when people mixed and matched parts to make a one-off engine before more parts became available, but it's more fun to do something a bit different.



The piston speed in a 289 is low though because of the short stroke so stock weight pistons are not usually an issue up to 7000 with ARP bolt equipped rods. 11:1 compression with the piston .030 in the hole means a loose quench and greater potential for detonation. Did you calculate compression ratio assuming the .030 "in-the-hole"?

Tracy Blackford: Anaheim Hills, Ca
www.pacificthunderperformance.com
65 Mustang, 331 custom built with 289 H beam rods and 383W piston, 282S cam, self-ported '70 351w heads, T5z, 9" w/3.89s. 430 [email protected]
blkfrd is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Muscle Forums : Ford Muscle Cars Tech Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel injection on a (67) 289ci? craigerGTA All Ford Techboard 1 02-05-2011 11:04 PM
67 289ci 2 barrel carb running rich craigerGTA Fairlane Pages 4 02-03-2011 11:05 PM
How to build up a 1966 289ci grades Mustang Pages (1965-1973) 13 09-02-2010 04:41 AM
Adjusting valves 289ci woody76 All Ford Techboard 3 11-24-2003 11:02 AM
cam choice w/ 2500 stall 289ci fasterdamitt All Ford Techboard 19 02-23-2003 11:00 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome