David Hayes

iTrader: (6)

I can't wait to hear the 4 rotor either. Yes we are going to take lots of pics and have video. Gong to try to use the GoPros for inside the car footage and the do some vids and stills from around the track as well.

Tem120

iTrader: (5)

Hah , I'm frustrated at not being able to go makes me wish I'd gone to this instead of the dragon

allrotor93

iTrader: (126)

2 stroke so it doubles or something like that

3 rotor is actually 4 liters in competition

Sabre002

iTrader: (3)

Put me in for full day then. I just was un clear as to if it was the rental or the FD test event was all.

I Want to Attend
1. Jonathan "Snappin necks and cashin checks" Hallenborg
2. Marshallbc
3.
4.
5.

I Want to Get Out on the Track as a Passenger
1.Tvon
2.Mdessouki
3.Driftfc3s
4.rx7se (My Mom has taken the day off as well so add her)
5. Islander
6. ledgebmx
7.
8.
9.
10.

I Want to Participate in the “Track Experience” Session - $35 Cost
1. ledgebmx (Beginner)
2. rx7se (Beginner)
3.
4.
5.

I am a Qualified Driver and Want to Drive in the ½ Day Session - $100 Cost
1. afgmoto1978
2.
3.
4.
5.

I am a Qualified Driver and Want to Drive in the Full Day Session - $200
1. thewird
2. Sabre002
3.
4.
5.

David Hayes

iTrader: (6)

No, the Deals Gap Rotary Rally is a must do event so don't think of it that way. If this goes well, maybe we can make it into an annual event that will complement DGRR. We will have plenty of pics and videos and then use it as a learning lesson for the future. Or at least as a "it was fun" thing.

DGRR has over 200 attendees and about 150 cars last I checked. To me, it's the best event of the year

t-von

iTrader: (8)

No Logan meant 5.2l as that's what a 4rotor breaths like regardless how Mazda measures the displacement. Not to confuse anyone but that's what it us and hears why.

Engine displacement is calculated by a SINGLE fuel/air combustion event per cylinder or chamber "as in rotary chamber" and not by multiple events. All engines displacement is measured at bottom dead center on the intake stroke. On a piston engine that's 1 cylinder times how ever many cylinders with a firing spark plug. Lets just use a 5.2l v8 as an example. 4 stoke piston engines need 2 crank revolutions to fire its full displacement. So only half the displacement is fired for every 1 rotation of the crank shaft. This means that only 2.6l of AIR was ingested and ignited to make power in 4 cylinders. We still have 4 more cylinders left that still have to ingest AIR an be ignited to make power. This will happen on the second rotation of the crank. Now after 2 full rotations of the crank, we now have had 8 power strokes and a total of 5.2l of AIR ingested to make power. Keep in mind that we have ONLY had 1 combustion event per cylinder.


Now measuring the rotary is exactly the same way. Bottom dead center on the intake stroke is what's measured in 1 chamber. You times that by however many chambers there are with firing spark plugs. We all know that Logans 4 rotor is based of 13b parts. So on a 13b when both chambers filled with AIR and you have a single combustion event in each chamber, you have ignited 1.3l of AIR in only 1 revolution of the eshaft. Were everyone gets confused with rotarys is that they think the displacement is measured over all 3 rotor faces. Each face has nothing to do with the total displacement so remember the basics. DISPLACEMENT IS MEASURED IN A SINGLE COMBUSTION EVENT PER CYLINDER/CHAMBER.

Since Logans 4 rotor is 2 13b's it is displacement rated as 2.6l when all 4 chambers have a single combustion event, however this all happens on a rotary in only 1 revolution of the eshaft. So in 1 revolution of Logans 4 rotor, his engine has moved and ignited 2.6l of air an all 4 chambers. The 5.2l piston engine counterpart has moved the exact same amount of air in 1 rotation of the crank. In the pistons 2nd revolution, it will have move another 2.6l and have finally fire it's FULL displacement amongst all 8 cylinders. The rotary however was already fired it's full displacement in it's 1st revolution and going on it's second round of ignition events. After two full rotations if the eshaft, we have now moved 5.2l of air in Logans 4 rotor.

Sorry for adding all this to the thread but hopefully this situation finally gets understood.

GtoRx7.

iTrader: (12)

Pretty sure rccaz was just joking around! No scallops because the 4 rotor has no side Ports :-)

Sabres car is my kind of style, looks awesome. Speaking of which how many cars in the test are black? Gordons, David and I have black fds.

Montego

iTrader: (1)

Given that you all are catering to Modified, is it safe to say that we won't know the results of the comparison until they publish their article a few months from now?

t-von

iTrader: (8)

^ Sorry about that Logan! Sometimes the little things are hard to explain without writing a mini novel. Logan no side ports? I was convinced you were building a duplicate setup to your semi pp 20b as you have already done so much r&d on the setup. Why the change? Are we trying to out Mazda Mazda with your 4 rotor.

David Hayes

iTrader: (6)

No, we are going to post up info as we go along or at least as soon as we can. I'm sure Modified will hold back on their thoughts and what they are going to write but for us, we'll give out as soon as we can.

We will have some objective testing done but the vast majority of comparison data will be "seat of your pants" stuff. I'd expect what one guy likes won't necessarily be what appeals to the next. And throw into the debate some of the cars are for the street and the others for the track, it won't be a clean cut process I imagine. Should be good fun and enough to fuel a further event too. Maybe that will the one where we finally end the rotary versus V8 debate. Oh come on, who am I kidding here? That sucker will go on forever

On another note and as a reminder, we'd like to know ASAP who is interested in track time or the "track experience". If you are interested and haven't pm'd Fritz, please do so now. Fritz, any other guys as of now cleared for the track? Do you think we will have enough participants for the full day?

Copeland

iTrader: (42)

Sounds great, can't wait!

RCCAZ 1

iTrader: (10)

I was (kinda), but I appreciate T-Von's explanation

patfat

Sounds like a great time. I'll be there for the PCA event and will book another night and come hang out Monday, would love to see the various rotaries. Will the cars be equipped with TraqMate or something similar?

GtoRx7.

iTrader: (12)

No room for large side Ports like the 20b. That would force usage of a big semi pport, which at that point simplicity wins. Big full pports it is :-) should go beyond Mazda in many ways. Still short in a couple though.

Montego

iTrader: (1)

awesome for a minute there I thought we might have to wait. As you have noticed many of us are quite excited about these results. I even contemplated flying out myself. However, due to a hectic work schedule I can't plan it accordingly.

M-

t-von

iTrader: (8)

Duh! I should have remembered that.

ptrhahn

iTrader: (9)

Pat!

I've got the AIM solo. Haven't figured out the data logging yet.

thewird

iTrader: (8)

I think the issue might be getting the word out. I don't think enough people are seeing this. Maybe post in the local forum?

thewird

rx7 SE

iTrader: (5)

I've been posting this link on my FD buddies' Facebook. I think a lot more people know about it than are posting on this thread.

Fritz Flynn

iTrader: (263)

See you at the PCA event, BOUT TIME!

Nassin31spr

iTrader: (3)

I'm definatly attending and if anyone has room I would love a ride a long.

Fritz Flynn

iTrader: (263)

Here's a vid of one my TT FDs on the S course last summer. FUN technical course

Fritz Flynn

iTrader: (263)

Trying to motivate some drivers. We need a few more to sign up

Maybe Pat will want to get out there in the Pcar?

Fritz Flynn

iTrader: (263)

Can't wait

afgmoto1978

iTrader: (6)

I'll spread the word at DGRR next week.