chris @ bhj

Hey all, Tin Zwicky gave me the heads-up on this. We are putting together a post that will address the issues discussed. Just give us a little bit more time, as we are juggling a lot of development projects here right now. Cheers, Chris @ BHJ

Below is the new link for the Harmonic Damper Tech Document referred to in post # 26. The original link is dead: http://www.bhjdynamics.com/downloads/pdf/tech/BHJDynamics_Damper_Info.pdf Cheers, Chris @ BHJ

That would be a preferable alternative to the pulley-only approach if you care about longevity. When properly done that may be a more affordable way to go, as long as the operational parameters of the engine are not pushed too far from stock (redline, long durations at high rpm, etc.) Keep in mind that stock harmonic dampers are designed for stock usage. Cheers, Chris @ BHJ

Hey All, Just an FYI... Here is the url for BHJ Nissan/Datsun harmonic dampers, pulleys, trigger wheels, etc.: http://www.bhjdynamics.com/index.php?main_page=index&cPath=10'>http://www.bhjdynamics.com/index.php?main_page=index&cPath=10 The main website address is: http://www.bhjdynamics.com/ Cheers, Chris @ BHJ

Hey All, Just an FYI... Here is the new url for BHJ Nissan/Datsun harmonic dampers, pulleys, trigger wheels, etc., as we have launched a separate damper website, since posting #3 was added above. Find all the Nissan/Datsuns here. The main website address is http://www.bhjdynamics.com/ Cheers, Chris @ BHJ

BHJ currently only manufacutres elastomer-style harmonic dampers. We use various types of elastomers, including rubber, depending on the tuning combination of any given damper. Physical size and design constraints of the hard parts are key elements in deciding which specific elastomer is used. A damper using springs would be referred to as a mechanical-style harmonic damper. These are typically larger (and often heavier) than elastomer dampers, due to the extra space needed to fit the mechanism into the damper. If anyone is interested in some in-depth (dare I say, "unbiased"?) harmonic damper tech, you can download our PDF Tech Document from the page linked below: http://www.bhjdynamics.com/index.php?main_page=page_3&zenid=amjn8brccr018bvjnf4hfc6de2 When you get to this page, click on the second link, titled "BHJ Harmonic Damper Technical Information Document" (230K PDF). This should provide plenty of fodder for good discussion. Cheers, Chris @ BHJ

We do not currently have one, but give me a shout and we can get to work on one. Chris @ BHJ ph. 510-797-6780

Just as a reminder, I posted photos and more info on the BHJ dual-pulley harmonic damper here: http://forums.hybridz.org/showthread.php?t=127184 Cheers, Chris @ BHJ

Hi Bryan, We hold a very tight tolerance when we finish-balance dampers and previously have not heard any reports like this. We are always interested in hearing about the performance of our products and would like to hear more about your experience with all the BHJ-made harmonic dampers you have purchased. Give me a call or shoot me an email if you'd like to go over this in more detail. Cheers, Chris @ BHJ

We do not sell the Rebello pieces directly, as they are made exclusively for Rebello Racing, so we don't offer any pricing to the public on the Rebello parts. The BHJ damper was created to work as more of an OEM-replacement part with added flexibility (PS Pulley, Trigger Wheel, etc.) and thus is a more complex design, which costs more to make than the Rebello models. You can buy the BHJ damper through your engine builder, Rebello, or any performance shop and in some cases you can get it for less than buying it directly from BHJ. We have an established "Racer Net" (retail) price, which we use for sale to the general public. If a reseller wants to sell BHJ harmonic dampers for a lower price, it is their right to do so. So shopping around is a good idea and is by no means discouraged by BHJ. You'll find this is the case with many other products and manufacturers out there. Cheers, Chris @ BHJ

In the vast majority of cases where components are designed to work together, there should be no need to rebalance the damper. With either the BHJ or the BHJ/Rebello setups, it would not be necessary as long as the new parts are installed properly. Since the pulleys and trigger wheels are zero-balanced and very lightweight components, relative to the harmonic damper, the crankshaft should not even know they are there. That said, we always leave it to your engine builder or crankshaft balancing shop to make the final call, as the operating range of any given motor may require lower or higher tolerances. Chris @ BHJ

Hi all, this is Chris at BHJ. I thought I'd post to clarify the differences in specs for the regular BHJ damper and the BHJ/Rebello dampers. 1. BHJ's Dual V-Belt Damper: Fits Nissan L24, L26, L28 6-Cylinder Internal Balance 5.95" O.D. 2.76" Overall Length 5.2 lbs. Gross Weight Aluminum Hub/Steel Inertia Ring Integral Dual 9/16", 5/8" V-Belt Pulleys SFI 18.1 Certified Available directly from BHJ, or through any engine builder, speed shop, etc. BHJ Part Number: NIS-IB240-280Z Options for this damper include: a. 60-2 Tooth Trigger Wheel, 7.25" OD - BHJ Part Number: NIS-240-280-TW b. Power Steering Pulley - BHJ Part Number: NIS-240-28-PSP c. 6-Rib Serp. Blower Pulley - BHJ Part Number: NIS-240-280-BP (This blower pulley is in the prototype phase, to be used in an upcoming Ken Jones story for Nissan Sport Magazine) 2. BHJ's "REB" (Racing) Single V-Belt Pulley Damper: Fits Nissan L-Series 4 & 6-Cylinder Internal Balance 6.1" O.D. 2.6" Overall Length 4.7 lbs. Gross Weight Integral 7/16" x 3.9" O.D. V-Belt Pulley for Racing Applications SFI 18.1 Certified Available exclusively through Rebello Racing BHJ Part Number: NIS-REB-6 Options for this damper include: 60-2 Tooth Trigger Wheel, 5" OD - BHJ Part Number: NIS-REB-TW 3. BHJ's "REB-SP" (Street) Single V-Belt Pulley Damper: Fits Nissan L-Series 4 & 6-Cylinder Internal Balance 6.1" O.D. 2.6" Overall Length 6.4 lbs. Gross Weight Integral 7/16" x 5.3" O.D. V-Belt Pulley for Street Applications SFI 18.1 Certified Available exclusively through Rebello Racing BHJ Part Number: NIS-REB-6-SP Options for this damper include: 60-2 Tooth Trigger Wheel, 5" OD - BHJ Part Number: NIS-REB-TW The regular BHJ damper was originally designed in coordination with Jeff Priddy, who can be found among your ranks. I'm happy to answer any other questions about the regular BHJ damper, but Dave or Charlie at Rebello may be better to ask about the BHJ/REB dampers. Cheers, Chris @ BHJ