merc 350 mag,carb spacer?

[fleopis67]

hi,im new to this forum,anyone ever tried a carb spacer?im talking about a 1 inch spacer such as those sold at summit racing,they are suposed to give more plenum volume and therefore a slight boost in hp,the 350 mag(93)already has a hi rise intake,would one of these add a little hp?just wondering? i read somewhere about some guy adding one and getting 1 or 2 mph ?

 

[mkast]

Re: merc 350 mag,carb spacer?

According to Dennis Moore's SBC book, avoid carb spacers and adapters, disrupts the airflow too much.

 

[fleopis67]

Re: merc 350 mag,carb spacer?

sounded to good to be true! thanks for the input !

 

[FreeBeeTony]

Re: merc 350 mag,carb spacer?

I have the same engine.......<br /><br />What type of boat do you have?

 

[f_inscreenname]

Re: merc 350 mag,carb spacer?

The only time those spacers have any use is at the drag strip or if you have a boiling fuel issue.

 

[fleopis67]

Re: merc 350 mag,carb spacer?

i have a 93 rinker 209 sport cuddy,350 mag,alpha 1,gen 2, runs in the low 60s,whats yours in ?

 

[fleopis67]

Re: merc 350 mag,carb spacer?

with the cost of fuel im gonna have mount a 10 horse ob,and just put put around all day!!!

 

[f_inscreenname]

Re: merc 350 mag,carb spacer?

Originally posted by fleopis67:<br /> i have a 93 rinker 209 sport cuddy,350 mag,alpha 1,gen 2, runs in the low 60s,whats yours in ?

A 1972 John Allmand / Super Nova. 360 mopar small block with a Volvo 270 outdrive. Old school all the way. Around 60mph @ WOT.

 

[FreeBeeTony]

Re: merc 350 mag,carb spacer?

My 350 Mag is pushing this 24' Grady.<br /><br />I converted it to a Vortec at the end of last season.<br /><br />Hope to be able to cruise ~30 this season.

 

[fleopis67]

Re: merc 350 mag,carb spacer?

thats a good lookin old schooler ya got there !!!

 

[f_inscreenname]

Re: merc 350 mag,carb spacer?

 

[fleopis67]

Re: merc 350 mag,carb spacer?

how do i up my rank from cadet???seems kinda low!!!why wont the capt. let me go home ????

 

[FreeBeeTony]

Re: merc 350 mag,carb spacer?

Gotta put the time in...........

 

[Bondo]

Re: merc 350 mag,carb spacer?

Originally posted by fleopis67:<br /> i have a 93 rinker 209 sport cuddy,350 mag,alpha 1,gen 2, runs in the low 60s,whats yours in ?

<br />48' long,..14' beam,.. 500hp,..13 ton capacity.........<br />Hull speed is 8mph,........ The bow starts to Dive at 9mph,+ the 1st 10'/15' of deck Disappears at 10mph.............<br />Hand-built by Myself,+ a Great Crew of 5 other Welder/Seat of the Pants Engineers................. <br />You can't see it in this picture,... But this Ship is built on/with 1200 gallon Propane Tanks as the Base of the design.............<br /><br />

<br />This 1 is a 1974 Starcraft 221 Islander,....<br />Repowered with a 4.3LX/Alpha 1,.....<br />Full Dressed Charter Fishing Machine,.......<br />It'll pull 44mph in Freshwater,+ 53mph in the Salt.......<br />Also Hand-Built,+ REengineered by Myself.............. <br /><br /><br />And,.... As stated by Tony,...... Rank comes with Time,.....Well,...... Actually it's Post Count Driven...............

 

[fleopis67]

Re: merc 350 mag,carb spacer?

what do you use that ship for?

 

[Bondo]

Re: merc 350 mag,carb spacer?

Heavy Transport to,+ from the Islands in the 1000 Islands area of the St Lawrence River.......<br /><br />Private,.. Non-Commercial cartage.......<br /><br />The friend who fianced it was building a multi-million dollar House on an island at the time,.........

 

[rodbolt]

Re: merc 350 mag,carb spacer?

carb spacers are great if you have the time and dyno to tweak them,<br /> that 350 gas motor at WOT wants air and fuel, the more we get in the more we get out.<br /> a spacer makes the engine think the intake runners are longer, thus you will get a slight boost in cyl filling due to the inertia of the aircharge and valve overlap at WOT, if the system is tuned. for most low RPM motors(below 6K) the spacer is a deterrant,especially if you need any power at the midrange.<br /> I have made them as tall as 5 inches.<br /> once intake tract volume becomes to large the fuel tends to puddle and low and midrange become very erratic. with a 4500 RPM stall converter,a 1500 RPM idle speed and 6.38 gears we did not care much about midrange. as a thread went earlier gasoline is a constant volume fuel that has an incredibly narrow ratio to burn. to much or two little by 2 parts and it does not work well at all, by three parts in may not even run.<br /> this ratio must be maintained regardless of RPM.<br /> before doing any engine mods pen must be placed on paper or the whole thing is a blind basketball game.

 

[Buttanic]

Re: merc 350 mag,carb spacer?

I believe a spacer with 4 individual holes on a dual plane manifold would be beneficial, not so with a open spacer.