Super Thunderbolt D motor

[CSR4C]

Previously on the Tohatsu – Bass D thread. I brought this up:

D Stock Solution

1. The Bass / Tohatsu motor.
2. All “44s” with a 55H tower & gear case. 55H min. wt. Flywheel, standard mag. Full cowls.
3. The “44” as above on the Bass tower & gear case as used with the Tohatsu setup.


This gives 5 motor options (44XS, Bass Tohasu, 44/55H unit, 44/Bass unit, 55H) so the D Stock class can grow. The Bass brothers will be able to sell their products. The racer that likes to scrounge parts can race economically. The racer that wants to buy new equipment and race can to that also.

Darrell

Response was good, so Larry Darneille and I have submitted proposed rules & specs. to the SORC for the Super Thunderbolt series of Mercury 44s. Lower Units are either the 55H type or the Bass enclosed exhaust & gear case. Anyone who wants a copy of the proposal, they can email me at: csr4c@jps.net

Darrell Sorensen

[sam]

I thought #2 was already in the rule book?

[CSR4C]

Sam,
The current motors legal for D Stock are the 44SX and the 55H.
Darrell

[sam]

I figured out what I was confused about: 40 ci Mk55 fishing blocks are legal as Mk55H's according to the Stock Tech Manual.

According to my 2004 rule book the legal motors were Mk55H, 402x and 44xs

I agree, 44ci 4cylinder blocks should be allowed. Darrell, please also include the Mk40H/KG9H mid as a legal piece.

The 402x should be bumped to C Stock or C Mod.

[mercguy]

approved.........

Previously on the Tohatsu – Bass D thread. I brought this up:

D Stock Solution

1. The Bass / Tohatsu motor.
2. All “44s” with a 55H tower & gear case. 55H min. wt. Flywheel, standard mag. Full cowls.
3. The “44” as above on the Bass tower & gear case as used with the Tohatsu setup.


This gives 5 motor options (44XS, Bass Tohasu, 44/55H unit, 44/Bass unit, 55H) so the D Stock class can grow. The Bass brothers will be able to sell their products. The racer that likes to scrounge parts can race economically. The racer that wants to buy new equipment and race can to that also.

Darrell

Response was good, so Larry Darneille and I have submitted proposed rules & specs. to the SORC for the Super Thunderbolt series of Mercury 44s. Lower Units are either the 55H type or the Bass enclosed exhaust & gear case. Anyone who wants a copy of the proposal, they can email me at: csr4c@jps.net

Darrell Sorensen

very good insider word is that this proposal was approved!!!

[mike ross]

don't forget that the Thunderbolt has to run a 1 to 1 gear ratio only

[crankbearing]

Rule on any d powerhead

Hey guys,

"MOTION TO ACCEPT THE SUPER THUNDER BOLT D MOTOR WITH THE ADDITION OF THE 44XS TOWER HOUSING AND GEAR CASE. ALSO ALL GEAR RATIOS WILL BE 1 to 1"

I do not think anything is gained here by the way the rule reads, you can only use early 44 powerheads on the 44xs mid section and lower unit. The 44xs tuner plate will need to be modified to accept any early 44 powerhead (pre1972) which makes it illegal in stock applications. The blocks from 73 to current were already approved at last years meeting. This does not allow the 55h boot or mid into the class if you read the rules. I have asked for clarification on the rule from Sorc but have not seen anything yet.

Regards,

[CSR4C]

The Super Thunderbolt D stock motor will be a probation motor this season, this means that you can run at non championship races, no points. Nov. 1 it will be a leagal motor.
I will be working with Mark Wheeler on the few remaining specs on the motor. The APBA (44SX) tower was added at the comissions request.
Here are the basics:
44 blocks that have Super Thunderbolt cast on them.
2# flywheel
1" KA carbs.
Magneto ignition.
Cowls, wraparound optionial
55H, APBA (44SX) tower with 55H or 44SX foot.
Bass tower & foot.
1:1 gears.
No tuners.

As soon as everything is finalized I will post it on Hyroracer.

Darrell

[mercguy]

Why do they insist on shooting themselves in the foot requiring the APBA tower, when the 55H tower is legal with a less than competive 55H?

All I can say is BIZZARRE !

Sam, I am not sure what you mean here, but the 55H tower is allowed with any of the Super Thunderbolt 44 powerheads......

[CSR4C]

The 55H tower is legal, all the commission did was add their APBA tower as they have had some made and would like to sell a few more.
Sam, you can start building you Super Thunderbolt motor with the parts you have.
Darrell

[brian]

So what this means....

I checked today I have several early 500 blocks with the off-set spark plugs that will bolt to a 44xs tower. So this is the motor to have because you get the tuner. "super thunderbolt" IS still stamped on these blocks. So this would or could be as fast as the 44sx block. maybe more punch because of the lighter flywheel.

I like this move but why not say any 44ci block in stock form. Does anyone feel a fishing vs an xs flywheel is ok, advantage xs owners which is the right way. The point is to sell xs towers so why not make the 55h foot legal on the 44xs tower too?

Is this now the instalment racing class. First year 55h tower with 40ci... 2nd year 44xs tower on 44ci... 3rd year 44xs complete. total cost 6500 or more over three years.

PS Do I have to use the 44xs cowls or the heavy 58a cowls? Do I need to have matching face plate and decals?

[crankbearing]

AH HAh!!!

The confusion sets in!!!

Brian as stated in Darrell's post above " No tuners". So In my estimation I can now run a Tohatsu D50 powerhead on a 44XS mid-section as long as I do not have to modify the tuner on the 44xs housing. Well this is awesome!!!



Regards,

[CSR4C]

The Super Thunderbolt D stock motor will be a probation motor this season, this means that you can run at non championship races, no points. Nov. 1 it will be a leagal motor.
I will be working with Mark Wheeler on the few remaining specs on the motor. The APBA (44SX) tower was added at the comissions request.
Here are the basics:
44 blocks that have Super Thunderbolt cast on them.
2# flywheel
1" KA carbs.
Magneto ignition.
Cowls, wraparound optionial
55H, APBA (44SX) tower with 55H or 44SX foot.
Bass tower & foot.
1:1 gears.
No tuners.

As soon as everything is finalized I will post it on Hyroracer.

Darrell

I think some members of this board need reading lessions!
Cowls must be of the same type as came on the Super Thundbolt motors with a face plate from the same. Paint color & decals are optional. I think a decal that just said "Super Thunderbolt" would be cool.
Darrell

[brian]

Details details details. I'm not an inspector and don't care for rules much. Missed the 55h foot on the xs tower. That is smart.

So I can run the tunner if it is on the xs tower, but no tuner for the bass tower?


Brian

[CSR4C]

No Tuner, mean NO TUNERS reguardless of which tower used. Bass, 55H, APBA/44SX
Darrell