V-6 Module ?'s
 

I've got a question for you guys. I've got a pair of Merc 420's that I rebuilt last year and installed a set of roller Reed cams I picked up from Mild Thunder. The Cam specs were 232/237. After talking with Bob at Marine Kenitics we used 1.7/1.8 rockers on it which Bob said would change the duration slightly to 232/241. So with that said, last year I used the V8-24 modules the curve was steeper than I wanted so I bought a set of V6-14 modules. I always thought they were a 14 degree advance but I was reading tonight that on a V-8 they are only 6-10 degrees advance. Should I find a set of V8-20 modules or am I going to be fine with the V6's? My biggest worry is starting the engines with an initial advance around 24-28 degrees!

what are you running for total timing,im thinking around 34,so 34 - 14 = 20.that is where your initial timing would be set at.also,i run 34 locked on my cat and absolutely no trouble starting,they turn over very fast and fire right up.

Mike- from what I've read it would not be 20 because the module is not designed for a V-8 so the resistance is off resulting in a 6-10 degree advance. The only way I know this is because I just read 4-5 separate post saying that all others were getting and why? I don't know why this would be, as my Crane boxes don't have 4,6,8 cylinder selector. If you're running 34 locked I should be fine. I just want to make sure what I have will work, if not I want to start shopping before spring gets here.

Mike, (endeavor32 Mike lol), lots of us running locked out timing, no starting issues. I'd verify full advance timing and set it to what you need at full advance, and let the base fall wherever it may. Reason the v6 modules starting being used is for more timing at idle, to help with idle quality with bigger cams and what not.

We used the V-6 modules back in the very late 80s and thru the mid 90s on our blower motors as the timing comes in much sooner, better Idle and acceleration thur the mid range, less heat build up also. Back to your question of start up cranking, I never had a problem with the advanced timing when starting no hard spots or kick backs you will be fine in that respect. might be hard to find at a good price. a lot of us "old timers" still use them over those "fancy blue MSD thingies" lol

Mike, Joe, Abones,
Thanks for the reply's. Sounds like I'm not going to have an issue so I'm going to use them. I really wish I could use the crane boxes I have but none of them seem to be working. I'm going to check them out this spring again but if I get the same results as last year I'm going to use the V6-14 modules that I have.

The V6-14 modules give about 10* of advance on a V8 engine and all the advance will be in by about 2500rpms. You should be fine running them. Just set total timing to 32-34* and let base timing fall where ever.

Thanks Griff- thats what I'm going to do!

I run the v6 modules and only pay attention to the full advance timing as MT suggests. I believe I get 11-12 initial and run 30* all in. I have no issues starting with the v-6 modules.

my merc 454-420 rebuild to 485 hp were a pain at idle when engaging. my engine builder switched to V6 module... a dream come true! end of trouble! should have done that the first year, not the fifth year when I sold the boat!!!

Jeff-
Do you have any idea what size cam you used? My engines should be making the same power but as far as speed goes I'm right where guys are with 415 hp 502's. My boat came with 330's so its the only baseline I have. I know I'm a little out of my RPM's, I'm at 49-5000 and should be around 53-5400. Before I spend the $$$ to get more RPM's out of my props I want to make sure thats the issue.

no idea. my engine builder did not want to give me his recipie!

Did you pay for the motor or did he give them to you? Last I checked most people wan to know what they buy. Most all good builders keep the small stuff that makes there suff better under there sleeve (chamber design,some types of porting, ect)but for the most part he should give a build sheet with the motor.
Just my 💭

Mike,

Move the 1.8 rocker to the intake. Is the lobe the TM***HR series, lift .340"/.578" at the valve w/ 1.7 rocker?

Bob

I wanna say it is Bob regarding the cam.

In several tests I've seen on the bbc setup, it seems the engines always responded Better to the 1.8's on the intake side, rather than the exhaust side. But that was mostly blown stuff, which one would think the exhaust side would need the help. But the dyno numbers proved the intake side worked better with the 1.8's, and showed gains.

I paid for the engines rebuild... he rebuild me between like 1 to 10 engines a year, more expensive of the area, but never breaks ! so I said rebuild, he asked me if we would change intake, the rest of the internal needed to be all new anyways, I said go, went on dyno, did 485 hp, was happy, and was all I needed to know ! I would have forget the specs anyways... !!!

griff, I have a 97 donzi 22zx that we built from 454 mag a 496 stroker, eagle bottom end iron head with great flow, procharger m2sc
with 3-5 lb boost, rm builder cam. Tried best to do all the right things only want to do once!!!!
Bob has all the number and specs and said should be around 600 hp, also same comments from Kim Barr Racing engines that did the maching etc.

Couldnt get timing correct so started reading and I purchased v6-14 module + wiring harness. Question I have Thunderbolt V, module is Thunderbolt IV module. disconnected noc senser, plugged in the wht/red, wht/grn, purple to purple, grey to grey

Noi start(no Fire) is there some type of jumper wire we need to do we didnt disconnect the TB V module from wiring since we thought that is where we will get fire there are only 4 wires which I assume go to matching spots

or maybe the module/wiring I got on ebay is bad.

Are there anything special needed to be done to make work

Hope this has made sense if not please ask away

thanks
egb

More google I think we were not grnding since we only have 4 wires it grounds from being mounted on dist. 5 wire v6-14 grounds to exhaust is that right track

so endeavor???

did you go V-6 module? how did it go?

Send you email addy to waybomb at gmail. I'll send you the TBIV/TBV manual that tells you everything you ever wanted to know about them.

This is an old post but I should refresh it if anyone ever reads it and wonder what the results were. I ran the 1.8's on the intake as Bob said Actually they were always on the intake, that was a typo that they were on the exhaust. I also am running the V-6 modules, the boat ran great all summer. The only thing I did all summer other than the ignition upgrade was put gas in it.