Changing ignitions
#1
Guest
Posts: n/a
Changing ignitions
Will I gain anything by changing from a mallory pointless ignition to a Thunderbolt IV ignition. My engine is a 468 9.5 to1 , large oval port heads, rpm air gap and 850 holley, 555/575 231/239 ultradyne cam. The ignition is on a stock 310 hp 454 that was left in my garage and the guy never came to get it this is over a year ago. I swapped engines for him and have not heard from him in 10 months. (Still owes me money and now storage fee)I am considering selling it(How much would it be worth?) as it is complete except for pulleys and a dipstick or tearing it down and making a duplicate of the engine that is in my boat as of now. It is just in the way. If I keep it what suggestions on preserving it I have oiled down the cylinders and it was winterized. Thanks
My wife wants it gone.
My wife wants it gone.
Last edited by FWK; 08-13-2003 at 09:15 AM.
#4
VIP Member
VIP Member
I'm assuming your Mallory distributor
has mechanical advance.
TB IV's have no mechanical advance
mechanisim, thus less moving parts
to possibly rust up and not move.
Is it going to make any perfeormance
difference: see Gary's and Dennis's
answers.
has mechanical advance.
TB IV's have no mechanical advance
mechanisim, thus less moving parts
to possibly rust up and not move.
Is it going to make any perfeormance
difference: see Gary's and Dennis's
answers.
#6
VIP Member
VIP Member
To the best of my knowledge,
TB IV's don't have a rev limiter
in the module, I believe there
is an additional rev limiter module
used on some of the HP engines
that used TBIV.
jt
TB IV's don't have a rev limiter
in the module, I believe there
is an additional rev limiter module
used on some of the HP engines
that used TBIV.
jt
#7
Offshoreonly Advertiser
Offshoreonly Advertiser
If you have a Unilite, I know that years ago the advance mechanism would loosen up, caused me a number of major problems. I like no moving parts.
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Marc
www.mercruiserparts.com
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It's not alive -www.BoatStuffExpress.com - temporarily retired
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
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02-21-2003 08:06 PM