marinized v12 running 2 x 808's

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
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jenko
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Re: marinized v12 running 2 x 808's

Post by jenko »

Had a run in the boat got some logging done with wideband ,mufflers were a success (no performance loss) and nice note.
Had an issue in second log (k2)at the 2.03 mark .engine bogged down a bit so I backed off straight away think we might have a slight misfire .
Will post both logs. K1 was 13:1 wot and k2 was 12.5 wot
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jenko
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Re: marinized v12 running 2 x 808's

Post by jenko »

spark plugs out revealed an oily plug ,leak down test revealed too much leakage around piston so looks like a tear down
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jenko
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Re: marinized v12 running 2 x 808's

Post by jenko »

detonation is a killer might get injectors flow tested
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vlad01
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Re: marinized v12 running 2 x 808's

Post by vlad01 »

Apparently jag v12 engines are really prone to detonation due to the poor squish area. Aftermarket pistons have show to fix that issue. Might be something worth looking at?
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jenko
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Re: marinized v12 running 2 x 808's

Post by jenko »

those are the aftermarket pistons with squish area
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jenko
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Re: marinized v12 running 2 x 808's

Post by jenko »

fitted an old bottom end that I had lying about not balanced and 9:1 comp 90 mm bore rather than 91mm bore 10.6:1 comp cost me 800rpm at wot but it will have to do for this summer boat still good for 80kmh .Pretty sury detonation was caused by to hot a heat range spark plugs plugs but shall rebuild bottom end with 10:1
photo after all trim finished
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delcowizzid
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Re: marinized v12 running 2 x 808's

Post by delcowizzid »

Awesome boat man
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem
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Holden202T
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Re: marinized v12 running 2 x 808's

Post by Holden202T »

yeah nice looking boat :)
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HQ355
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Re: marinized v12 running 2 x 808's

Post by HQ355 »

Nice !
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vlad01
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Re: marinized v12 running 2 x 808's

Post by vlad01 »

So what has the detonation actually done. Damaged the rings or something?
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