MattJeavons

Yep - I did ask this over in AFF - not sure what FB is - and I agree - a good shop tuner maybe able to fix my problem and save me chasing bugs.... However - exactly as you have said here - Marty may or may not be able to fix my problem ; experience should say he would probably be on the money - however there is no guarantee. My neighbor uses another dyno/tuner that he swears by - But as I said in AFF - this is part of the fun of it for me - and I was hoping to get some advice on the forums from anyone else that may have experienced the same thing....rather than just get pointed in the direction of paying someone to do it - which again - as I said - the money has and never will be the driving factor - I honestly was trying to get ideas from anyone who may have had similar problems....and try and fix it myself.....and if not - no worries. Or - start a thread that if anyone else out there may have the same thing - they can read and get advice - maybe I'm off track here - but I thought that's what this was all about - ppl sharing knowledge. Sorry if I am sounding a little pissed off - but I was never hoping for a miracle cure - or expecting one - just advice from others with experience that could potentially point me in the right direction or share ideas on possibilities without having to go to a shop and see someone I don't know and/or trust to not get ripped off. Maybe its been a long bloody weekend and the JD is talking....but I've read ton's of posts over the years that have been more than helpful and others not so much - as you can see from my post count - I'm not a big poster - but getting smart arsed replies like the above is the reason I have never bothered and after seeing many others get shot down in flames for maybe asking a stupid question....I can't be farked.....if that wasn't the intent - no worries - but either way - the fun has been sucked out of this.... Call this thread closed - I apologise for anyone trying to help!

G'day lads - checked the vacuum readings - was at 1.5 turns out on the IM screw - 10 vac ; changed to 0.75 turns out and vac went back to 15 which is what it was before - turns over way easier than last night!! Slydog - don't take my lack on interest in rushing off to Marty as a negative - as Ando said - I'm trying to eliminate anything obvious before taking it to someone to get something obvious pointed out...... Once I've got what I think is a solid list of issues ; changes made etc - I'm off to Marty for sure - that way there won't be any reinventing of the wheel in regards to what has already been done. Spent the day pool fencing with the neighbours - so no work on the old girl tonight - new lifters should arrive tomorrow - will whack those in during the week - then if the problem is still there - I'm confident I've done anything I can - hoping Marty can point me in the right direction then - really hoping to crack the mid 13's - that way I can give my cousin - with a bloody holden LS1 - a run for his money lol

G'day Sly - thats exactly where it will be going in a few weeks - wanted one last crack at trying to solve the prob and last night was the chance to try a few things on the track. Short of these lifters coming on monday changing the game - off she goes!!! At least running mid 14's seemed more respectable - but as always - it's never fast enough.... Nice when you can at least cross the line 1st for once lol

I bloody bet - a 302 would be a nice fit - the bloody crossy is a touch long for the XP.....have to run the thermo on the front for clearance!! Live in Narangba - bout 40mins north of brissy city.. Well went out to the drags - here is the update! Took the fuel filter out of the bowl (still got the usual inline job before the pump) and dropped in a set of BP7ES plugs..... Runs as rich as hell on idle - struggles to start without opening the throttle a bit - loads of smoke out the back - but once she gets going - no worries - not sure if I need to jet it down and too late to rip a plug out until tomorrow and check the colour.... Considering the float hasn't been touched - thinking time to lower the jets. In saying that - problem still stood - anywhere between 4,000-4500 it starts coughing. But - did run a new PB - this same motor combo - short of carby changes/timing tweeks etc - started at mid 16's - went to mid 15's 3 weeks ago with the new C4 and higher stall - and tonight with the holley 500 on it running rich - went to 14.5 - all I have to do is get these extra revs and I'm hoping to slip it into the 13's... While I was do the changes today - took a compression test - each cylinder rated between 200-220 psi.....a set of anti-pump up lifters lob Monday which was a shame - would have loved to have trialled that tonight. Also took the dizzy cap off - heats of white junk on the terminals - and you can see scorch marks across each cylinders internal tab - from half way to the edge - button was good through....going to change cap/rotor anyways.

Yeah - fair enough - would make sense - def no need for an additional filter. Just feeding the rug rats now then i'll slip out to the shed and rip it out .... Yep - the engine is raised to cover clearance - this was how I bought the car 5 odd years ago - thought about converting to a 302 but after I blew the first motor up - I already had this one half built on the side so stuck with the crossy - nice easy motor to work on and a good learning curve and had plenty of spares available - hence the 200 rod combo ; had only previously played with Harleys for years - this the first car I'd owned for a long time lol Only had the chance to get my C4 built just before xmas - so running that now with a 2200 stall - sweet to cruise around with and solid off the mark (even though the diff is 3:23's) but last trip to the track was only running mid 15's - that's when I discovered this rev problem - missing out on a good 1000 of RPM - think that might help the times lol

Either way - i'll grab a set of 7's today and remove the fuel filter in the bowl - see how that goes.....3pm we hit the road but I'm also on kid duties - just hoping I can get the old girl to roar

No stress Ando - run my own business and was having a shocker of a week lol Then spending nights trying to fix this for the drags tonight has made for a long week!! What has been weird is I've run colder plugs before - 6's and 7's - and there weren't fouling but def black just cruising around - this is my daily drive and I regulary sit on the highway and around town on cruise... Was wondering if that filter could cause an issue - it is a common thread - already have a normal inline filter with this in the bowl - i'll take it out this morning. After taking the cover off - was happy to see I'm a long way from bind - those springs are good to .6" lift from memory - with the pushrods - any advice - one has a rounded off type ball end - I've had this into the lifter - wondering if it should be the other way around? Tpak - yes - 3 rev limiters but as Ando has said - need 12v switch to operate the burnout/retards - not running either of those - just the overall limiter - had it set to 6k just to rule it out.... Thanks again lads!!

Yep - no EST - all through the MSD... Plugs are a touch white - but I haven't played with the carby yet - just whacked a set of 68's in there.....but again - nothing changed - so wasn't a priority yet. Will change the PV back to a 65 and potentially jet it up a bit.... Check the installed height - spot on....but as you can see - on full lift - they aren't binding. Attached is also a piccy of the pushrod I'm using - currently the ball end is on the lifter side - wondering if I have that the wrong way round.... In terms of fuel side - new pump / filters etc - the only thing I'm unsure about is the additional filter going into the bowl that sits inside the speedflow fuel line.....but can't imagine that should be stuffing me up... Cheers lads!

Bear - just changed the fuel filter to be sure - cut the old one open - was dirty - but not feral.....there is another filter that sits between the carby bown and speed flow fittings.....it's clean - but could that cause a prob?? Also recently change to a new fuel pump - this was all in trying to eliminate fuel as the problem... In terms of changes... It started with stock valve springs / 350 holley.. Same problem... So i changed to heavy duty springs (with the dampners) etc along with switching to a bigger carb... Ando - going to rip the valve cover off and check the geometry again - but pretty confident that was golden - but def going to check All i thought i had left was fuel and spark - hence the fuel pump/filters.....then the bigger carb - no dice... The camshaft was installed dot to dot with a double chain - didn't appear to be any issues there and glad the EST dizzy seems to not be the cause... Stupid question - if the lifters were pumping up or i'm getting coil bind - wouldn't i have thrown a valve into the piston? o Cheers!!

Phasing is something I've read about with the EST dizzys and MSD programmables - lots of ppl recommending using the TFI dizzy instead but buggered if any of my local wreckers have one..... In saying that - Ando - happy to hear you haven't had any issues with it - never thought i had a problem until now. Long story short - was running without a tacho until only the last month - thats when i noticed the 4k limit....hooking up the lappy to the MSD unit - the tacho and software are very close - so fairly confident the tacho is right... In terms of timing - nothing radical - 14 base to 30 tops all in by 4k. At first I thought that was the issue - but after moving the timing around substantially - nothing changed. Tried backing the timing right off - same prob. Gerg - I was going to check the phasing next - but as you said - even if it was out - there is no way to adjust it anyways. Few more details that may help : Valve springs are brand new - the lifters are prob a few years old now though. Running the 500 on a redline manifold. Standard plugs - BP5ES - was thinking of going colder - but didn't think that was my prob. Thinking i should swap out to the normal oil pump and try a set of anti-pump up lifters ; while i'm there i'll recheck the springs but confident i installed those correctly - but definately worth the check again.. Thanks for all the help lads!! This is the first engine i've built - so trying to nut out bugs is bloody good fun but just as frustrating lol

stupid question - going down the anti-pump lifter path - I can use my YT rockers? (they aren't the adjustable type - street terra from memory) If the high volume oil pump and lifters are an issue - could that be the solution? or am I missing a trick - don't feel like breaking a valve at the track lol

Thanks Thom - for pointing out my MSD and EST and 500 holley are whipped in the arse by a stock webber and dizzy lol..... That's whats been pissing me off the most - pumped some money into a few solid bits and pieces then can't rev past 4,000 ; running down the 1/4 mile knowing you can't rev it up is more the frustrating... Only running standard lifters - prob no more than 2 years old.....would it be worth throwing some anti-pump up jobs in there? Got a standard, electronic, dizzy here - was going to throw it in on the weekend just to see what happens - at least that would let me eliminate spark/dizzy as the problem? Thanks for the help lads - this has been driving me nuts for weeks.....

G'day Gerg, Using the 7738-12 springs - 110lb pressure with the inner dampner - and retainers and collets to suit..... The cam specs : 2000-4800 valve timing @ 0.006"inlet opens 40 (BTDC) closes 71 (ABDC) Dur 292 exhaust opens 82 (BBDC) closes 29 (ATDC) Dur 292 valve timing @ 0.50" inlet opens 3 (BTDC) closes 31(ABDC) Dur 214 exhaust opens 45 (BBDC) closes -11 (ATDC) Dur 214 lift at 0.495" and yes - running a high volume oil pump......the more I read about that - maybe should've left the standard one in there!

G'day All, Looking for some crossflow advice.... 250 crossy - 200 rods combo - 500 holley - stage 2 dynotec cam - running MSD programmable with a EST dizzy....crow H/D springs etc.... Originally thought the carb was too small (was running a 350) - however same problem... Once I get past 4k revs - more like 4500 - it will stop revving and run very rough - and if I back off the throttle - it's as rough as guts then steadys again - close to stall - but no worries.... This happens either under load or free-revving in neutral.... Fuel side is golden - and tried different coils - keep coming back to either valve springs (these are brand new) or the EST dizzy. Keep readings how the EST has the wrong phasing - so I've backed off the timing and same prob - Any advice on what to check for next?? cheers, matt