Piston selection

« **on:** January 19, 2014, 03:15:57 PM »

Hey fellas havent been here in while but anyways gettin the boat ready for summer gonna finish the motor up blew her up last summer I have 454 block a #6223 gm 427 steel crossdrilled crank 781 heads havent been cc'd yet I do have a howards solid cam but will have one cut im wanting a decent shelf piston that doesnt cost 900 has anyone used the srp 212133 it will get me 10.6-11:1 where I wanna be and its only 600 bucks should I spend 8 for more quality or these okay to use thanx socal

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #1 on:** January 19, 2014, 03:38:06 PM »

Quote from: bigred88 on January 19, 2014, 03:15:57 PM

Hey fellas havent been here in while but anyways gettin the boat ready for summer gonna finish the motor up blew her up last summer I have 454 block a #6223 gm 427 steel crossdrilled crank 781 heads havent been cc'd yet I do have a howards solid cam but will have one cut im wanting a decent shelf piston that doesnt cost 900 has anyone used the srp 212133 it will get me 10.6-11:1 where I wanna be and its only 600 bucks should I spend 8 for more quality or these okay to use thanx socal

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

Good pistons...
Don't mean two squirts of piss it isn't put together correctly though.

-beerjet-

« **Reply #2 on:** January 19, 2014, 03:40:53 PM »

Sweet they were so much cheaper than every thing else I had a lil concern

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #3 on:** January 19, 2014, 03:49:08 PM »

I want to say they are cp's "off the shelf" piston

-beerjet-

« **Reply #4 on:** January 19, 2014, 04:32:14 PM »

Quote from: bigred88 on January 19, 2014, 03:15:57 PM

Hey fellas havent been here in while but anyways gettin the boat ready for summer gonna finish the motor up blew her up last summer I have 454 block a #6223 gm 427 steel crossdrilled crank 781 heads havent been cc'd yet I do have a howards solid cam but will have one cut im wanting a decent shelf piston that doesnt cost 900 has anyone used the srp 212133 it will get me 10.6-11:1 where I wanna be and its only 600 bucks should I spend 8 for more quality or these okay to use thanx socal

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

Sounds like too much for used. IMO

Sent from my iPhone using SoCalJetBoats

« **Reply #5 on:** January 19, 2014, 04:34:05 PM »

Thats new cost not buying used pistons

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #6 on:** January 19, 2014, 06:18:50 PM »

Those pistons are a really good part and would be more than suitable for your application. On thing is, they are a 30cc dome... so with 781 heads, should net you about 9.9-10.4:1 cr @ zero deck (ranging from 114cc to 120cc on the heads).

600-ish ain't too bad for those... I typically get 570 for a set of the 10:1 dome SRP... but then there is the cost of the brown truck...

« **Reply #7 on:** January 19, 2014, 09:44:27 PM »

Would it be better to 0 deck the block or take more off the head to reach my compression goal

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #8 on:** January 20, 2014, 08:57:14 AM »

0 deck would actually kill two birds with one stone... get you a tighter quench area, and help get the compression up a bit. The gains are greater per .001 surfacing the block than the heads just due to cylinder bore vs. chamber shape. If you really want to get into the mid to upper 10's though, I'm thinking you're gonna end up doing both... but don't guess, measure, measure, measure... then cut.

« **Reply #9 on:** January 21, 2014, 10:19:18 AM »

I plannwd on gettin a marine cam ground for the boat I have this cam already in the garage would this cam be a decent choice since I already have it or dnt even consider using this?

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #10 on:** January 21, 2014, 11:03:57 AM »

That is a solid roller or flat? The lift seems a little low for the 342/333 advertised duration. 112 centerline? That seems wide to me, but I just like tight centerlines. If that is a new unused cam, I would save it. You might consider having a good usable core reground into the cam that you want; that could save you ~50%. For example, to replace my Crane solid roller is $440 and to regrind my existing (billet) core is only $176.

Cheers,

Joe

« **Reply #11 on:** January 21, 2014, 12:08:45 PM »

Quote from: bigred88 on January 21, 2014, 10:19:18 AM

I plannwd on gettin a marine cam ground for the boat I have this cam already in the garage would this cam be a decent choice since I already have it or dnt even consider using this?

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

I'd stay away from that cam... the only two times I ever use a reverse split is in something with really bad intake ports and good exhaust (like a peanut port) or certain turbo applications. Also, depending on how old it is, you'd have to have it cam doctored to see EXACTLY how they arrived at 342/333 advertised duration... some old grinders used to use .006" lift... some .001... some at the lash point... and some at .020... so it's kinda hard to say which method was used. Regardless... I'd go with something to fit your deal, rather than just because you have it... flat tappets are really not that expensive.

What exactly are you building? Headers? Logs? Etc...

« **Reply #12 on:** January 21, 2014, 12:09:09 PM »

Its says lobe center 112 and say lobe centerline 108?

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #13 on:** January 21, 2014, 12:12:42 PM »

Ya six o 9 I thought I seemed like a really wierd grind I have basset twisty 781's 219 valve victor intake 750hp carb 11:1 or close to it havent selected cam yet was gonna get a recomendation for someone to call to grind me one or if someone might recomend a shelf marine xe cam or something simular im not opposed to shelf cam but im wanting the most out of my budget build o berkely 12j/g A imp

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #14 on:** January 21, 2014, 12:15:28 PM »

I have everything except pistons rings machine wrk and cam it was running last summer spun bearing just kinda puttin together new shortblock and havin heads milled to what I need valve job etc

Sent from my SAMSUNG-SGH-I527 using SoCalJetBoats mobile app

« **Reply #15 on:** January 21, 2014, 09:20:53 PM »

Schneider has a JB296F-10 that works pretty good as far as shelf grinds for an A impeller, unported oval port with headers.

« **Reply #16 on:** January 22, 2014, 12:17:40 AM »

Quote from: bigred88 on January 21, 2014, 12:09:09 PM

Its says lobe center 112 and say lobe centerline 108?

The cam lobes are ground on a 112 degree centerline. The intake lobe centerline should be installed at 108 degrees ATDC. That means that the cam either has 4 degrees advance ground into it or it is recommended to be installed advanced 4 degrees.

bigred88

Piston selection

beerjet

Re: Piston selection

bigred88

Re: Piston selection

beerjet

Re: Piston selection

Jet Boat Maloney

Re: Piston selection

bigred88

Re: Piston selection

Six-Oh-Nine

Re: Piston selection

bigred88

Re: Piston selection

Six-Oh-Nine

Re: Piston selection

bigred88

Re: Piston selection

Flusher

Re: Piston selection

Six-Oh-Nine

Re: Piston selection

bigred88

Re: Piston selection

bigred88

Re: Piston selection

bigred88

Re: Piston selection

Six-Oh-Nine

Re: Piston selection

Flusher

Re: Piston selection