IHRA · Engine

Aftermarket connecting rods, IHRA

IHRA answers this part for 29 of its classes. 1 of those answers permit the part outright and 5 permit it with stated conditions, leaving 23 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 23 are inferred from how the class is written rather than quoted from a rule naming this part.

This page is IHRA only, and the bodies do not agree. The same part under IJSBA. Which one applies to you is decided by whoever sanctions the race you enter.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Where it stands, class by class

29 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

What each answer below means

Not permitted, not listed in the rules

Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.

Legal, with conditions

Keep it, but measure it: the rules permit this part only inside stated limits.

Legal

Keep it. The rules permit this part in this class.

No rule, this is an open class

Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.

Not permitted, not listed in the rules 19 classes

On a closed list an unlisted modification is not permitted. · A.2.2, J.1

• Runabout Endurance
• Runabout Lites
• Four-Stroke Ski Lites
• Runabout GP2
• Runabout GP3
• Ski GP2
• Drag, Sea-Doo vs Sea-Doo
• Sport Spec
• Drag, Sea-Doo Pro Stock
• Drag, Yamaha Spec
• Ski 1100 Modified
• Ski 1500 Modified
• Ski GP3
• Drag, Sea-Doo Spec
• Runabout Limited
• X2 Vintage
• Ski Vintage
• Drag, Super Stock
• Drag, Turbo No Nitrous

Legal, with conditions 1 class

Replacement connecting rods may go into a crank rebuild, ferrous only, with rod length unchanged and the assembly within 5 per cent of original weight. · O.2.2

• Ski Lites

Legal, with conditions 1 class

Factory compression must be maintained. · DD.1

• Drag, Yamaha Pro Stock

Legal, with conditions 1 class

Model-dependent. Four Stroke Ski Lites keeps the crankshaft stock and names no rod allowance, so a four-stroke entry may not change rods. O.2.2 lets a two-stroke entry rebuild its crank with replacement connecting rods, ferrous only, with rod length unchanged and assembly weight within 5 per cent. · N.2.2, O.2.2, J.1

• Ski Limited

Legal, with conditions 1 class

Ferrous only. Rod length may be changed. · K.2.2

• Ski GP

Legal, with conditions 1 class

Ferrous only. Rod length may change. · V.2.2

• Sport GP

Legal 1 class

Aftermarket or modified connecting rods are allowed, with no material rule, and rod length may be changed. · X.2.2

• Runabout GP

No rule, this is an open class 3 classes

The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.

• Drag, 2 Stroke Unlimited · DD.12
• Drag, Stand Up Unlimited · DD.10
• Drag, Unlimited · DD.6

No rule, this is an open class 1 class

No restriction in section CC, and CC.1 permits any modification it does not restrict.

• Freestyle · CC

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Aftermarket connecting rods: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IHRA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.