Is thier some reason why I cant do a thru transom exh. system on 225 crownline with a volvo penta.I have the 5.7 GXI-DP SBC with thottle body inj. HP rating online says 320 is this correct.The sales person told me 280.Any help would be appreciated. Thanks
There shouldn't be any reason why you can't go with a "through the transom exhaust" but you will be unhappy if you are looking for any performance improvements on a small block Chevy. Be sure that you use tips with flappers AND external salsbury type flappers (use both).
Sincerely
Dennis Moore
Will this help performance at all.I was planning on changing exhaust manifolds.They want 1700.00 for the side exit exhaust.I rather spend the money on a better manifold.
I don't know what exhaust manifolds you have (Mercruiser or Volvo) but I have installed all types of different high performance manifolds on Big Block Chevy marine engines and it always makes a big difference but very seldom have I been impressed with installing high performance manifolds on small blocks. The small block doesn't have the exhaust volume of a big block and the performance increase is less.
Check out the GLM small block exhaust manifolds. They are very reasonably priced, are a direct bolt on and increase performance as well as anything else.
GLM is in Monrovia, California 626-357-0077, they are the manufacturers but will tell you where you can buy them.
I'm interested in the same mods, more for the sound though. Thanks for the info Dennis.
jstwkd & SchellSchock, If you want the nice sound & a little power on your small block I'll say good luck but DON'T go with the side exhausts. They don't sound quite right, kind of listening to a 4 banger on each side I think the merging of the two exhausts near each other helps each one compliment each other hence the nice sound you get! And you may want to install a switchable exhaust so at times you can hear it & other times its quiet. I call it the Bitch switch & let you figure out the rest.
[ September 09, 2002, 04:41 PM: Message edited by: gnarley ]
Makes me wish I could put a crossover tube on exhaust like my cars, (Suburban and Vette both with Small Blocks). Seems to mellow exhaust note while still sounding Baaaaad!
If you have a Mercruiser with "through the prop exhaust" you do have a cross over tube. It connects the exhaust manifolds before it enters the transom.
Dennis
I'm running a 2000 Volvo 5.7GSi,DuoProp, F8's will ThruTransom help any?????
Hey jstwkd,
Have you tried the Crownline website? I bet you could find all your answers their. I have seen Crownlines with the side and hull exhaust and I agree the thru hull sounds better. I just saw a new Crownline two weeks ago on the lake, it looked around 23' and had thru hull exhaust and sound great.
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